BMW part number 63121378339 (superseded by 63128350141) is a headlight intermediate distance piece (also called a ball-pivot mounting stud or adjusting element) that fits 1987–1995 US-market BMW E30 3 Series, E32 7 Series, and E34 5 Series models. It acts as a fixed-length spacer and ball-socket pivot between the headlight mounting frame and the lamp housing.
- E30 3 Series (1987–1993). Fits ellipsoid/replaceable-bulb headlight assemblies on 318i, 318is, 318ic, 325, 325e, 325es, 325i, 325is, 325ic, 325iX, and M3 models. (Earlier sealed-beam E30 headlights from 1984–1987 used a different adjuster design.)
- E32 7 Series (1988–1994). Fits 735i, 735iL, 740i, 740iL, and 750iL models (including both standard halogen and 1993–1994 Xenon headlights).
- E34 5 Series (1989–1995). Fits 525i, 525iT, 530i, 530iT, 535i, 540i, and M5 models.
What It Does & How It Works
- Fixed Pivot Point. Each BMW E30/E32/E34 headlight bucket uses two threaded aiming screws (
63121378368) for vertical and horizontal adjustment, plus one fixed intermediate distance piece (63121378339) as the third anchor point.
- Ball-and-Socket Hinge. The plastic ball end snaps into a socket on the headlight housing while the threaded stud mounts to the carrier bracket, allowing the lamp to pivot smoothly as you turn the two aiming screws.
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