BMW part number 63121378369 (superseded by 63128350142) is a headlight adjuster screw bushing / grommet (often listed as a Black Rubber Bushing, Headlight Adjusting Element, or Adjuster Nut) that fits 1984–1995 US-market BMW E24 6 Series, E30 3 Series, E32 7 Series, and E34 5 Series models. It snaps into the metal headlight carrier frame and serves as the threaded receiver socket for the headlight aiming screws (63121378368) and fixed pivot studs (63121378339).
- E30 3 Series (1984–1993). Fits ellipsoid/projector and replaceable-bulb headlight buckets on 318i, 318is, 318ic, 325, 325e, 325es, 325i, 325is, 325ic, 325iX, and M3 models. (Not compatible with early 1984–1987 sealed-beam headlight frames.)
- E24 6 Series (1987–1989). Fits late-production ellipsoid headlight assemblies on 635CSi and M6 models.
- E32 7 Series (1988–1994). Fits 735i, 735iL, 740i, 740iL, and 750iL models, covering 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 & Quantity Needed
- Threaded Anchor Receiver. Snaps into the square/slotted cutouts on the metal headlight support bracket so the steel aiming screws (
63121378368) can thread in and out smoothly without stripping or rattling.
- Prevents Headlight Shake. Over time, heat and age cause these plastic/rubber bushings to turn brittle and crack, which leads to vibrating headlight beams and an inability to hold aim.
- Quantity Per Car. Most E30, E32, and E34 dual-lamp assemblies use 3 bushings per lamp bucket (6 per side, or 12 total per vehicle).
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