Any place online you can cross reference parts. I have a mazda ,2 fords and a chevy in the driveway. Right now I'm looking for a headlight switch that will fit a 1989 B2200 and it's hard to be sure what fits without a cross reference guide.

This isn't online, but if you can get your hands on a Hollander Interchange Manual, it should list the cross references for these models.http://www.hollanderinterchange.net/ many salvage yards use these, so if you call some local salvage yards they may be able to tell you.