Finding parts from other trucks that will fit mine?

[Majik]

Hey guys!

I have an 88 Mazda B2200 LB p/u, and need to replace a few parts on it.. My first project being that my heater fan died over the summer and with Winter coming up I need to replace it soon!!

Im trying to save a few $$ by pulling the parts myself out of yards (or even looking on Craigslist for em)... The snag im hitting is that other then looking for an 88 Mazda pickup to get the parts from, Im not sure what other models are compatible? So basically im trying to find out how I can expand my search for parts by looking in other year/brand/model pickups???

Any advice?