Popped a shear pin on my blower and dug out the manual to order some new ones. I came across something I forgot I had. It's a listing of sears source prefix numbers and the corresponding manufacturers. It's from the antique small engine collector's club, might be usefull in tracking down parts. This is how I found my snow cab.
http://www.asecc.com/data/sears.html
http://www.asecc.com/data/sears.html