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Botter Manufacturing Inc.

BMW E30 Convertible Hardtop Support Plugs - Replaces 51431942787 and 51431942788

BMW E30 Convertible Hardtop Support Plugs - Replaces 51431942787 and 51431942788

Regular price $45.00 USD
Regular price Sale price $45.00 USD
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!

These have been a long time in the making. We cannot think of a better way to complete our E30 convertible trims package than with a fully re-engineered version of these hardtop support plugs. There are many issues with the original plugs: they have an irregular shape that seems to not look good in any position, the original rubber of the plugs degrades after many years in the sun, and they always pop out and get lost - leaving behind an exposed hardtop mounting post.  We wanted to fix all of these issues with our offering.

Product Details:

  • Quick, spin-in-place install through the use of an embedded stainless steel pin that will not wear fast or rust from the outdoor elements.
  • Clean boxy design to eliminate the odd-looking design of the original plugs.
  • Intuitive fitment. These only install in one direction, unlike the original plugs.
  • Built-in rubber spring to ensure a snug fit on your E30.
  • Features a matte and textured finish - which pairs very well with our Hatch and Tonneau Cover trims.
  • FITMENT NOTE: Please see the last photo for fitment details. Our hardtop support plugs only fit into the "twist in" style hardtop mounts. Most E30 convertibles have the twist in style of mounts, but some do not.
  • Made out of ASA plastic to hold up to high temperatures and increased UV exposure.

Left” side replaces OEM part numbers: 51431942787 51-43-1-942-787 , 51 43 1 942 787 ,

Right” side replaces OEM part numbers: 51431942788 51-43-1-942-788 , 51 43 1 942 788 ,

Click here to watch the installation how-to video for this product!

Our hardtop plugs pair nicely with a fresh set of our re-engineered E30 convertible hatch trim covers and tonneau cover trims. Click on the pictures or links below to check them out! If you'd like to purchase all of our convertible trims as a bundle and save 20%, please check out our E30 Convertible Trims Bundle.

 E30 Convertible Hatch Trim Covering

E30 Convertible Tonneau Cover Trim Pieces

 E30 Convertible Trims Bundle

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

Based on 1 review
John Olthuis
Lars is an amazing engineer

Lars has come up with so many e30 innovations. He is a great asset to our community.

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