You have an AFM, not a MAF, and your best bet is to find the one that came off! Haha, but if you are set on buying another try to find someone parting a M42 car and buy their AFM. Expect to pay around 50-100 bucks depending on how quickly the seller hopes to get rid of it. I would post a wtb thread on here and some of the more frequented e30 boards, i.e. r3v, e30tech, bimmerforums. Good luck.