This is a tough one. Not even Snapper Tech Support seems to know the answer: I bought an older but never used Snapper "38YTST" in a yard sale several yrs ago for $50 but have been unable to identify the tractor that matches it. The closest match that I have found in on-line documentation is a 1650. All other Snappers seem to required a drive shaft style snow thrower. Mine has a belt drive. On line, 1650 throwers are shown with belt drives but are always at least 42 inches. And 1650's appear to be hard/impossible to find. So, I'm hoping that a LT 12 or LT 16 might work. Any ideas would be greatly appreciated.