Several Years ago i bought a muffler for my 140 farmall, thing was the muffler was short so i could get the tractor in my basement, when i sold the tractor i had no other muffler so i had to let it go with the tractor, i recently bought a super A and need to get the same muffler to go on it, but now i can't find it anywhere. I'm pretty sure i got the first one at TSC, a farmer friend of mine has the same one on his super A and i got the measurements off his, the inlet diameter is around 1 7/8 - 1 15/16 inch and the outlet is 1 3/8 inch, 17 inches total length, he has a inch and a quarter rain cap on it, the muffler wasn't stamped stanley but had these numbers on it "51E91" i can get a bigger outlet on a muffler that same length but the tractor's exhaust isn't enough to lift the larger rain cap very good. If someone might know of a muffler this size i would love to find it but if you know a place that could custom make me one of those measurements