This is a genuine BMW connection flange, part number 11 53 1 722 531. The number stamped on the part is 11531722531; BMW's catalog files it under the short number 1722531. You will find it on our Engine shelf, under Thermostat and coolant lines.
It fits every E36 body style (320i, 323i, 325i, 328i and M3, 1992–1999), with the M50, M52, S50 or S52 engines — and the European-market versions.
BMW draws it on 4 diagrams, among them Waterpump - Thermostat (11_1503) and Waterpump - Thermostat (11_4931). It weighs about 240 g (0.5 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
