MX-5 Miata NA/NB Delrin Window Bushings

If you’ve noticed your windows moving at a sluggish rate, or if they seem to “tip” and bind halfway through their travel, you are experiencing a classic NA/NB trait: the failure of the factory window guide bushing. Over three decades, the original rubber bushing degrades into a sticky, high-friction mess that clings to the guide rail, putting immense strain on your window regulator and motor.

Our Delrin Window Bushings are a simple, permanent solution to “lazy window syndrome.” By replacing the soft, perished factory guide with a CNC-machined Delrin (Acetal) component, we eliminate the primary source of drag within the door assembly. Delrin is naturally self-lubricating and dimensionally stable, meaning your windows will glide smoothly for the remaining life of the car.

Key benefits

• Restored Window Speed:Significantly faster up-and-down travel by removing the mechanical drag.
• Regulator Protection: Reduces the load on your window cables and motor, potentially saving you from an expensive regulator failure down the road.
• Smooth Operation: Eliminates the “stuttering” or tilting effect often seen when the factory bushing begins to bind.
• Permanent Fix: This is a “one and done” upgrade that will not need to be replaced again.
• Easy Installation: A straightforward DIY job that can be completed in under an hour per side with basic hand tools.

This kit is for you if:

• Your windows move noticeably slower than they did originally.
• You can hear your window motor “straining” to close the glass.
• You are performing a door refresh or installing new speakers and want to address a known weak point while the door cards are off.
• Pro Tip: While these are self-lubricating, we highly recommend cleaning the old, solidified grease out of your window tracks and applying a fresh layer of high-quality lithium or PTFE grease during installation for the best results.

Fits all 1989-2005 cars (Mk1, Mk2 and Mk2.5).

Shipping worldwide.