This is a genuine BMW heater duct left, part number 64 11 1 393 323. The number stamped on the part is 64111393323; BMW's catalog files it under the short number 1393323. You will find it on our AC & Climate Control shelf, under Other Heater and Air Conditioning parts.
It fits the E36 sedan, coupe, convertible and touring (318i, 320i, 323i, 325i and 328i, 1992–1999), with the M40, M42, M43, M44, M50 or M52 engines — and the European-market versions.
BMW draws it on the Outflow Nozzles/Covers (64_0161) diagram. It weighs about 112 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.