Up for sale is a set of UUC Underdrive pullies that I recently bought. The pulleys are in used but good condition, the previous owner said they were used on his E36 M3. When I tried to install them on my E30, the P/S pulley was not compatible with the pump I have, so therefore they are back up for sale. I believe these will fit OBD1 24V motors (but I'm really not sure as they didn't fit my car), the pullies are labeled numbers 3 and 4, I have contacted UUC and I will update the posting if they are able to tell me the exact application. I will include a brand new properly sized belt for use with these pulleys that will ship straight to you. Price for these pullies with a brand new belt is $140 shipped.
You can read more from UUC's Website here: http://www.uucmotorwerks.com/udp/
You can read more from UUC's Website here: http://www.uucmotorwerks.com/udp/