The C-197/ARC-3 control seems to be the scarcest part of this set. I need one for my set as well, I subbed a BC-631 jack box from an SCR-522 in mine. Works OK, and looks authentic, but it's just not right. Mike Morrow wrote: > I've been looking for the transmitter mounting rack MT-238/ARC-3 for years for my set. I would not mind finding a C-197/ARC-3 either.