BMW 73102017-1 Rear Left Inner Door Window Belt Weatherstrip 428I Seal

( Manufacturer Part Number: 73102017-1 ), ( Type: Window Seal ), ( Features: Easy Installation, No Drilling Required ), ( Placement On Vehicle: Left, Rear )

Review BMW Rear Left Inner Door Window Belt Weatherstrip Seal Oem fits 430I F36 2015–2020

The **BMW 73102017-1 (15-20, 428i/430i, F36) Rear Left Inner Door Window Belt Weatherstrip Seal** is a precision-engineered rubber and polyurethane composite component designed to ensure a perfect seal between the inner door panel and the window regulator mechanism in BMW s F36 428i and 430i models produced between 2015 and 2020. This high-performance weatherstrip seal serves as a critical barrier against wind, dust, water, and road debris, maintaining cabin comfort and preventing unwanted noise infiltration while the vehicle is in motion. Crafted from durable, weather-resistant materials, the seal is engineered to withstand the rigors of daily driving, including temperature fluctuations, UV exposure, and mechanical stress from repeated window operation. Its unique design features a flexible yet resilient profile that conforms seamlessly to the door s contours, providing an airtight and watertight seal that enhances fuel efficiency by reducing aerodynamic drag and improving overall vehicle performance. The seal s robust construction also helps mitigate condensation buildup inside the door panels, reducing the risk of mold, mildew, and electrical corrosion that can compromise the integrity of the door s electrical components over time. Whether replacing a worn or damaged original equipment seal or upgrading for enhanced durability, this aftermarket part is a direct-fit solution that restores factory-level functionality while offering improved longevity compared to generic alternatives. Ideal for both professional installers and DIY enthusiasts, the seal s straightforward installation process ensures a clean, professional finish, restoring the door s structural integrity and aesthetic appeal. By maintaining optimal sealing performance, this component contributes to the long-term reliability of the vehicle s interior systems, ensuring a quieter, drier, and more comfortable driving experience.

### **Pros and Cons of Buying a BMW 7 Series (F36) Rear Left Inner Door Window Belt & Weatherstrip Seal (2017-2020, 428i/430i)**

1. **Improved Comfort and Convenience** A worn or damaged window belt and weatherstrip can cause rattling, drafts, and poor sealing, leading to cold air infiltration and noise. Replacing these components restores a tighter, quieter cabin environment, enhancing overall comfort during drives.

2. **Prevents Further Damage** If the window belt or weatherstrip is cracked, frayed, or stretched, it can worsen over time, potentially damaging the window regulator or allowing moisture to enter, leading to rust or electrical issues. Replacing it early prevents costly repairs down the line.

3. **Maintains Resale Value** A well-maintained BMW, especially one with updated interior components, holds its value better than one with neglected parts. Addressing wear-and-tear items like these signals to potential buyers that the vehicle has been properly cared for.

4. **Better Window Operation** A stiff or misaligned window belt can cause the window to stick or move unevenly. Replacing it ensures smooth, consistent operation, which is particularly important for safety and convenience.

5. **Aesthetic and Functional Upgrade** The F36 7 Series (2017-2020) already features premium materials, and updating the door seals can make the interior feel more refined, especially if the original components were degraded.

6. **Easier Installation for DIYers** While some BMW repairs require specialized tools, replacing a window belt and weatherstrip is a relatively straightforward job for those with basic mechanical skills. Many aftermarket kits include clear instructions and compatible parts.

7. **Compatibility with Aftermarket Upgrades** If you plan to modify your 7 Series (e.g., adding tinted windows, sound deadening, or interior upgrades), ensuring the door seals are in good condition prevents additional complications during installation.

---

1. **Cost of Parts and Labor** While individual window belts and weatherstrips are relatively affordable (typically $50 $150 each for aftermarket parts), labor costs can add up, especially if you take it to a BMW dealer or specialty shop. DIY installation saves money but requires patience and precision.

2. **Potential for Counterfeit Parts** Some aftermarket suppliers sell low-quality or incompatible parts that may not fit properly or last as long as OEM components. Researching reputable brands (e.g., ACDelco, Dorman, or BMW-specific suppliers) is essential.

3. **Time-Consuming Installation** Removing the door panel, window regulator cover, and other components to access the belt and seal can take several hours, especially for inexperienced DIYers. Improper handling may damage surrounding parts.

4. **Risk of Overlooking Underlying Issues** If the window regulator itself is failing (e.g., sticking, grinding, or not lifting properly), replacing just the belt and seal won t fix the root problem. A thorough inspection is recommended before purchasing parts.

5. **Limited Long-Term Warranty on Aftermarket Parts** Unlike OEM components, aftermarket window belts and weatherstrips often come with shorter warranties (if any), meaning you may bear the cost of replacement if they fail prematurely.

6. **Potential for Misalignment** If the belt or seal isn t installed correctly, it may not seal properly, leading to drafts or noise. This could require redoing the job or accepting a less-than-optimal result.

7. **Environmental and Material Considerations** Some weatherstrips contain materials that may degrade faster in extreme climates (e.g., excessive heat, cold, or UV exposure). High-quality rubber or silicone seals are more durable but may cost more upfront.

---

Replacing the rear left inner door window belt and weatherstrip on a **2017 2020 BMW 7 Series (F36, 428i/430i)** is a **practical and cost-effective preventive maintenance** task. The benefits improved comfort, noise reduction, and prevention of further damage far outweigh the drawbacks, especially if done correctly. The main challenges lie in **part quality, installation difficulty, and ensuring no underlying issues exist**.

For **long-term reliability**, prioritize **OEM or high-quality aftermarket parts** from trusted suppliers. If you re comfortable with DIY work, this is a manageable project that can save hundreds in labor costs. However, if you re unsure about the process, consulting a BMW specialist ensures proper installation and avoids potential pitfalls.

- **Buy the parts** from a reputable source (e.g., **BMW Approved, ACDelco, or Dorman**) to ensure compatibility and durability.

- **Inspect the window regulator** before purchasing parts if it s worn, replace it simultaneously to avoid future issues.

- **Follow a detailed guide** (e.g., from **Chilton, Haynes, or BMW-specific forums**) or seek professional help if unsure about disassembly/reassembly.

- **Consider a full door panel refresh** if the interior looks worn, as this can enhance both function and aesthetics.

- **Budget for $100 $250 total** (parts labor if outsourced), depending on part quality and labor rates.

**Final Verdict:** **Worth the investment** if done correctly, as it extends the life of your 7 Series and maintains its premium feel. Prioritize quality over cost to avoid repeated replacements.

Details:

The product is a genuine OEM rear left inner door window belt weatherstrip seal for 15-20 BMW 428I 430I F36. This high-quality seal ensures a tight to keep out water and noise, enhancing the overall functionality aesthetics of vehicle. This window seal is designed by BMW and specifically for the rear left side of vehicle. It features easy installation without the need for drilling, providing a reliable and convenient solution maintaining structural integrity of cars interior.

part #: 731020171 prices

• $40.00-$56.05

specifications vintagwinde:

• for models: 430i, F36
• for makes: Bmw
• for years: 2015-2020
• mpn: 73102017-1
• type: Window Seal
• features: Easy Installation, No Drilling Required
• placement on vehicle: Left, Rear

payments vintagwinde:

• credit card: Diners-club
• other
• wallet: Google-pay
• money order

returns vintagwinde:

• policy: No Returns

shipping vintagwinde:

• service: USPS Ground Advantage
• type: Calculated
• class: Standard
• cost: $19.94
• carrier: USPS
• transit: 5-10 Days

general vintagwinde:

• Exterior Parts Accessories > Glass Window Parts > Window Seals, Gaskets Trims
• condition: Used

seller vintagwinde:

• city: wood mere, New York
• rating: 100.0%
• # reviews: 7

offer vintagwinde:

• started: April 29, 2026
• quantity: 1
• availability: In Stock
• best offers: True
• options: Ship-to-home
• sold: 0

Bmw 73102017-1 Is Similar To:

• 1984-1987 Bmw Window Regulator Left Front (29.2% similar) Used window regulator only does not include motor in good condition fits: left driver door BMW318I 2-DOOR coupe 1 e I ix 1988...(January 5th, 2017)
• 51321804922 Bmw Passenger Right Vent Window Tii Ti Alpina Turbo (27.6% similar) Bmw 2002 and 2002 TII vent window this is the entire assembly, including: frame glass gasket misc...(October 28th, 2018)
• 51321809762 Bmw Crank Window Lifter (27.4% similar) ...(February 26th, 2019)
• 61318373771 Bmw Rear Window Sunshade Switch Dsc (29.4% similar) ...(January 21st, 2019)
• 6978846 Bmw Window Lift Motor Right Front Fits Series (28.2% similar) Remanufactured window lift motor fits: right front bmw 128I 2008 -2013BMW 135I...(March 3rd, 2018)
• Bap-bm1551101 R Bap Fits Bmw Series Right Pass Rear Door 648609850116 (24.1% similar) These parts are designed for USA production model's and may not cross over worldwide applications. Then in most cases orders ship free...(October 25th, 2018)
• 1600ti 51321801246 Bmw E10 1500 1602 1802 2000 2000tii 2002ti 2002tii Window Knobs 10-6 51326654364 (31.9% similar) Please see photos for exactly what you get. Used, varying condition knobs...(August 26th, 2016)
• 51361822923 51361822924 Bmw 1602 2002 Rear Vent Window Bracket Ti Tii 1966 To 73 24 (39.5% similar) Bmw rear vent window bracket, ti Ti 1966 to 1973 , oem these brackets are in great condition. See photos no reserve...(September 4th, 2016)
• 7258534.9 Bmw Window Lift Motor Right Front X3 F25 Crossover Suv 7258534 New 47-21029 (24.1% similar) Part #: 7258534.9 prices...(September 29th, 2016)
• 51326454321 Bmw Right Vent Window Regulator (31.8% similar) None of the usual slop in gear when open position. This looks like a right side vent window regulator to me. Fresh out of a long term storage about 20 years. I try to give an accurate of the items list...(July 15th, 2021)
• Bmw 51328226105 8226105 Oem E46 2dr Driver Left Front Door Exterior Chrome Window Guide Rubber Seal (44.7% similar) Oem bmw E46 coupe and convertible front driver left exterior chrome window rubber guide in great condition. Part fitment will vary due to several different factors: the vehicles build date month year. Sedan, convertible, wagon or coupe. Electric/manual, leather/vinyl, sport/standard etc. Manual or ...(August 17th, 2023)