Can any one out there help me to understand the model numbers on thiokols ect. 1200,1201,1202 A,B,C does it have to do with the year or the equpment on the cat . Also what makes soom have steel skin and soom aluminum. My model # is 1202 std std I assume is the track (pic in snow depth)also after LMC went out of business were any record keep by anyone to get a history of my cat thanks to all Larry