I have an old Snapper belt drive walk behind. Keep it around as a spare for our hydros. Noticed this year that the tranny is getting pretty sloppy. It is a peerless 700-050. I have noticed many other trannies that appear the same and have the same spline count and double output but different model numbers on ebay for low cost. Are the cases the same? Would it bolt up? I am not so worried about ratios. Could one of these work or should I just get an original for $250.00?