Genuine BMW part 35 40 1 163 243: Retainer spring. The number stamped on the part is 35401163243; BMW's catalog files it under the short number 1163243. You will find it on our Brakes shelf, under Other Pedals parts.
It fits every E36 body style (318i, 318ti, 320i, 323i, 325i, 328i and M3, 1992–1999), with the M40, M42, M43, M44, M50 or M52 and other engines — and the European-market versions.
BMW draws it on the Accelerator pedal/bowden cable LHD (35_0448) diagram. It weighs about 10 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.