Heres a great idea: go to a local salvage yard, and find an E21 what has been wrecked or whyever its there, rip the ENTIRE ac system out of it, and install it into your car. Itll probly be cheaper that way then aftermarket, and MAKE SURE to replace all those O-rings. They make retrofit kits for R-134A too, so when you replace the O rings replace them with ones that are compatible with R134A refrigerant. Id sell you mine out of my E30, but I havent done an AC deleat yet, and I need the electric cooling fan. Plus I also dunno if an E30 AC system would fit into an E21. But I will be doing an AC deleat in the future, coz all it is to me is deadweight that I dont want in my car. I already drained its refrigerant so i could pull the condenser to make it easier to access the front of the engine when I repaired it. Im seriously amazed with BMW ac systems, because unlike most American or even Japanese made vehicles, they DO NOT EVER leak their refrigerant. It still had all of its refrigerant in it.