Here's a 1972 Gates and a vintage Dayco belt catalog that covers pretty many, many AATVs from 1972 and earlier. Maybe Mike can make this thread a sticky or save it and load it to the manuals section of the site too. There are even some odd ball AATVs I've never heard of or seen listed in there too. You'll have to sort through it to find your machine because the AATVs and snowmobiles are all mixed together, but it shouldn't take very long to locate your specific machine because everything is listed in alphabetical order. They're larger files, so they may take a little time to load, but well worth it.

http://www.pacificnorthwestvintagesn....org/id12.html