Some items from this specific schematic: Bolt 5/16-24x3/4", Washer,lkextrn7/16, Pulley,alt 2 Groov, Wshr,flt,sae7/16".
On this parts fiche the Bolt 5/16-24x3/4" is the most specified component.
Check out any of the fourteen Belts - Pulleys components enlisted.