If you're talking about the plastic end caps, then no. I'm not aware of anybody making them. If you really need to replace them you'd have to fabricate aluminum segmented end caps to replace them. Treat them well.
Call Colaws RV salvage they may have used ones available, shipping won't be fun.
Colin Hyde has segmented kits pre cut and drilled, at least for the front, not sure about the rear. You could call him and check.