Genuine BMW part 31 12 0 429 578: Retrofit kit, control arm. The number stamped on the part is 31120429578; BMW's catalog files it under the short number 0429578. You will find it on our Suspension shelf, under Other Front Axle parts.
It fits the E46 sedan, coupe and convertible (320i, 323i, 325i, 328i, 330i and M3, 1999–2006), with the M52, M54, M56 or S54 engines.
BMW draws it on the Retrofit kit, control arm (03_3392) diagram. It weighs about 5.3 kg (12 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
