This is a "Transition year" machie? or a conversion? No Big front wheel? Generally 3 belt snow trac's have the larger front windows, which you have, the rear windows to either side of the rear door, which you have, and large front wheels. "transition year" machines often have brake drums in both the engine compartment and carrying the sprockets. But it looks like your machine has the wide front sprockets and small wheels up front? A Conversion?