I could take the belts off and take them over to the parts store
and let them measure them, but I'm hoping someone can tell
me what size V belts these are.

Troy Built Tiller

7-Troy-Bilt 954-04090 (replaces 1916657)
Forward Drive Belt Your price: $13.13

8-Troy-Bilt 954-04091 (replaces 1916658)
Reverse Drive Belt Your price: $12.45

Thanks. ~Pooh Bear