This is a genuine BMW antenna cable, part number 84 54 9 405 542. The number stamped on the part is 84549405542; BMW's catalog files it under the short number 9405542. You will find it on our Instruments & Electronics shelf, under Other Communication systems parts.
It fits the E36 sedan (318i, 320i, 325i, 328i and M3, 1992–1999), with the M40, M42, M43, M50, M52 or S50 engines — and the European-market versions.
BMW draws it on the Retrofit kit, window antenna (03_3107) diagram. It weighs about 73 g (0.2 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
