Dump Truck Parts Besides A Junk Yard, Where Online Can I Find Parts For A 1968 Chevy C50 Dump Truck?

Besides a Junk Yard, where online can I find parts for a 1968 Chevy c50 dump truck? - dump truck parts

I have several pieces of online shops, but none of them in 1968 Chevy C50 appears as a model. This is a 2.5-ton truck.