Answer to my own question... The secret is to search by dimensional specifications: - inlet diameter - body shape , diameter, length - outlet diameter and shape The kind folks at Caterpiller can match up almost any muffler. The others are Jet, Dobson and some more under construction/agricultural machinery. I was fortunate, the boo boo on mine was a 20 dollar tig weld repair. Thanks, JimCould not find one either take it up to a local shop they should be able to come up with something