WTB Honda 450 Upper Fork Tree

[joe fxs fxr]

My brother just bought a project bike to get started the restoration world. It's a 1974 Honda CB450 DOHC like our father used to have, and it is pretty complete. One major problem is the upper triple tree is cracked where the tubes clamp. Apparently this is a common problem.

Does anyone have one they would sell? Or advice on what years are the same?

Thanks, Joe