Maybe this will help. You have a 38 inch deck. I can't seem to find the deck S/N breakdown, so if you deck has cast iron ends, then use the first listing instead. Since it's on a 149, it should be one the third version (71-74) but who knows what someone else put on the tractor, so it could be anything.
Somebody else will chime in shortly with the exact deck S/Ns. But since the two later models use the same belts, unless your deck has cast iron ends (instead of sheet metal) then the listings circled should work. Your tractor serial number is in 472205.
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