Craftsman Gt5000 Deck Belt Size

Craftsman 191273 replacement belt made to fsp specs. I have a 2005 craftsman gt5000 garden tractor and here recently every time i go to mow the yard it shreds the primary deck belt (goes from the motor to the deck.) at $30 a pop it is getting pretty expensive because this is the 4th one. The routing diagram for a craftsman gt 5000 ground drive belt shows how the best must be wrapped around each pulley.
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