Eddie's has 1" bulkheads, I just bought one yesterday. They arent threaded inside though, they are slip fit. I have my old 1" bulkhead I wont be using, but the gasket is bad on it. I called Union to see if they had any double threaded, they dont, but can order them.
I never checked with Tony at Swamp Bottom though. I was thinking of trying him hoping maybe he had some extras laying around from the move.