Please see part number 26 on this website's page. This belt if for your exact model. The part number is listed and you can also purchase it from here if you like.
http://www.yardpartswarehouse.com/parts-look-up.html?arismn=12227#/Troy-Bilt/21A-512-081_Tuffy_Tiller_12227%2c_12227_Tuffy_Tiller/Power_Train_Assembly/003620-C/0036200016
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