Original BMW Tail Light Lens Gasket for E30 318i, 325, 325e, 325es, 325i, 325is, and M3 (1984–1991)

On the E30 3 Series and M3, this Original BMW gasket seals the tail light lens to the backing plate of the lamp assembly, keeping dirt, road grime, and moisture away from the bulbs and electrical contacts inside. Over time the old seal turns brittle and breaks down. Once it stops sealing, water and debris can reach the lamp's electrical parts and ruin them. A new gasket restores a tight seal between lens and housing. BMW gives the weight as 27 g, and this gasket is made in the Czech Republic and sold as a single piece.

Original BMW Parts carry a 24-month parts warranty.

BMW began producing this number in November 1983, and it supersedes 63-21-1-368-821. BMW approves the newer gasket for cars originally built with the older number, so early E30s take it directly. In BMW's parts data the same gasket runs across the E30 range, from M10 four-cylinder cars through the M20 six and the S14-powered M3. That is why one part covers both an early 318i and a late M3.

Technical Details

• Manufacturer: BMW
• Part number: 63-21-1-370-679
• BMW part name: gasket
• Function: seals the lens to the lamp backing plate
• Weight: 27 g (0.95 oz)
• Production start: November 1983
• Supersedes: 63-21-1-368-821
• Made in the Czech Republic
• Sold as one gasket
• Warranty: 24 months

Common Questions

Why does an old E30 tail light collect water?
The lens gasket becomes brittle with age and stops sealing, which lets moisture and dirt reach the bulbs and contacts.

Is this the same as 63-21-1-368-821?
Yes. It is BMW's replacement for that earlier number and fits cars originally built with it.

A fresh lens seal is one of the simplest ways to keep an E30's rear lighting dry and working.

Fitment & Compatibility

Compare your production year and trim against the table below. With over 20 years of parts and fitment experience, PMB Performance can match this to your VIN.