I have a David Brown 1200 A Slectamatic that I am in the process of replacing the clutch. When the clutch blew up, it also destroyed the muff coupling and input shaft. I have a new clutch for the tractor, but we can't find the other two parts anywhere. MC Drake in Arcade NY is doing the work, and he used to be a David Brown dealer, and needless to say, he can't find the parts either. Can someone please help me? This is the first major issue that I have had with the tractor in the 18 yrs. that I have owned it, and it has been an awsome tractor, and I would hate to think that I have to scrap the tractor because I can't find these 2 parts. Part # for the input shaft is K917727. Muff coupling part # is K919641 Any and all help would be greatly appreciated.