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Botter Manufacturing Inc.

BMW E30 Convertible Rear Euro Chrome Bumper End Caps - Replaces 51121937413 and 51121937414

BMW E30 Convertible Rear Euro Chrome Bumper End Caps - Replaces 51121937413 and 51121937414

Regular price $86.00 CAD
Regular price Sale price $86.00 CAD
Sale Sold out
Shipping calculated at checkout.

Please allow for a few days lead time before your order is shipped. We are a small team working out of a mighty 110 square foot workshop in rural Canada. Your business is incredibly valuable to us!

Looking for a cheaper option? Check out our discounted factory seconds in The Graveyard.

Shop The Graveyard.

The Graveyard is a section of our storefront where you can find fully functional discounted parts that have blemishes (our version of "factory seconds"). If you're someone who cares more about function than form, The Graveyard is meant for you!

If there aren’t any items of interest currently listed in The Graveyard but you’d like to be notified of new releases, feel free to sign up for our mailing list here. Don’t worry, we won’t bombard you with emails like most other companies do. We only share the important stuff!

Introducing our E30 Convertible Rear Euro Chrome Bumper End Caps, compatible with E30 cabrios that have a standard European early (pre-facelift) rear bumper. The passenger side is no longer available and the aftermarket alternatives on the market were not up to our standards, so we decided to make our own.

Product Details:

  • As usual, we've thought of ways to improve our offering rather than just copying the original part. We've reverse engineered our end caps to use grommets instead of the two small side screws on the originals. The two small screws on the originals are a pain to get to with any normal tool when installing or uninstalling the end cap from the bumper. With our new grommet design, simply line the end cap over the holes, press it in place (top first), and proceed to bolt it to the car with the main mounting bolt.

  • Proudly Offered in two Finish variations to suit your needs:

    1. FDM Printed: This style is made with a traditional 3D-Printer and layer lines are visible from close-up. This is geared towards those who are on a budget. This is the most cost-effective solution while still offering all the qualities of a high-quality replacement part.

    2. Resin Printed, Hand Sanded, and SEM Trim Painted: This style is geared towards those who want the best. This finish provides all the qualities of an OEM+ part: we resin print your end cap(s) out of high strength engineering resin, wash & cure your part(s), hand sand the outer faces, and finish it off with two coats of SEM trim paint to match the black trim on your rear bumper. You will not be dissatisfied with this option: “this is what I personally run on my E30 😉” (words from Lars, Founder of Botter Manufacturing).

  • Hardware Add-On: Our end caps are fully compatible with OEM hardware if you still have yours (the speed nut and the M6 mounting bolt). But if you don’t, or you would simply like to replace it with new, we have you covered for a low cost of only $3 Canadian per side. 

Click here for installation instructions!

Left” side replaces OEM part numbers: 51121937413 , 51-12-1-937-413 , 51 12 1 937 413 , , 1937413 , 1937413.0

Right” side replaces OEM part number: 51121937414 , 51-12-1-937-414 , 51 12 1 937 414 , , 1937414 , 1937414.0

Shipping Policy

Order processing times

After your order is placed, it can take up to 5 days for us to make your product(s) before they ship. We maintain some stock on specific products, but many of our products are made to order.

Free shipping & shipping costs

All orders to North America over $140 Canadian dollars qualify for free shipping. This is automatically applied at checkout. Shipping is automatically calculated for your selected products based on your location for lesser order values.

Hassle-Free Replacements or Returns

We offer hassle-free replacements or returns. We work one-on-one with any customer who has an issue with their order(s). If you have any issues, please Contact Us, and we will work out a solution with you. We look after our customers on a personal level, no matter the circumstance. We are car enthusiasts as well and we want all other enthusiasts like you to be happy with your order and your experience!

Customer Testimonials & Reviews

Are you looking for that extra bit of confidence to justify your purchase? Don't just take our word for it, hear what our customers have to say about us!

Terms and Conditions - Product Use


Botter Manufacturing Inc. products are designed for off-road use only. All products are never intended to be used on public roadways. Botter Manufacturing Inc. is therefore not liable for any damages caused to property, vehicles, persons, the environment, or any other entity through the use of our products on any roadway or road course. By purchasing product(s) from Botter Manufacturing Inc. you agree to use our products according to the above terms.

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Customer Reviews

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Have you ever wanted a custom model car of your E30? Please help support our side venture - Moddables - in our upcoming Kickstarter campaign.