Blade belt size for a 17.5hp 42"cut Yard Man mower

If you could give us a model number we could tell you.

Hi,
If it has no idlers on the deck, it uses the 754-0371A; and if it has two idlers, it uses the 754-04060B. The cross for the first seems to be 5/8" x 74" and the seems to be 1/2" x 96.5.
Peace,
Clarke