I am looking for a Hustler Fast Trak deck belt diagram. The one on the lawn mower shows a pulley that we can't find. Thanks.

Hi,
You can get the manuals here (but there are serial number breaks, so you may want that handy first:
Manuals
Peace,
Clarke

If you have not consulted the PARTS MANUALS, they are in the right hand column of this page:
Manuals

Pulleys seem to be abundant.

UM