You might also try East Broad Top. There were hundreds of rusty hoppers with 3/4 size couplers in the yards back about 1983. Many with trees growing thru them even back then, so obviously they're never going to run again. Maybe the owner (Kovalchik?) will part out some of themnow -- a few years back, he only wanted to sell complete cars. We bought #889 then, and I know several have gone to D&S and CTS among others.
Try to contact Stan Hall who is the current manager.