This is a genuine BMW clamp, part number 12 42 1 289 448. The number stamped on the part is 12421289448; BMW's catalog files it under the short number 1289448. You will find it on our Electrical shelf, under Other Engine Electrical System parts.
It fits the E36 sedan, coupe and compact (318i, 318ti and 320i, 1992–1999), with the M40, M42, M44 or M50 engines — and the European-market versions.
BMW draws it on 3 diagrams, among them Battery Cable(battery Front) (12_0397) and Battery Cable(battery Rear) (12_1516). It weighs about 50 g (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.