Not only is it hard to find aftermarket parts its hard to find stock parts like brakes and hub assemblies and stuff like that. I've had the best luck finding rare parts for my truck on partstrain.com. Here's the link. PartsTrain.com - Hard to Find Auto Parts and Truck Parts

 

Jcwhitney has them. Their normal site doesn't "recognize" w250's. You have to go to www-b.jcwhitney.com and look under 84 dodge w150. They sell the vent window gaskets individually. Same listing has a complete weather stripping kit including rear window seal (which is a ba$t3rd to find) for under 300. if you need a rear window seal alone I think I found it under an 83 dodge w350. Not listed under anything else (w/d 150,250) even tho they're identical freaking cabs,doors, glass.


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What kinda 1st Gen parts you looking for?