Jack,
go to http://www.gates.com/ and enter your part number but,,, put a space between 7345 and XL and you'll see this:
http://www.gatespowerpro.com/Comergent/en/US/adirect/gates?cmd=catSearchFrame&returnURL=http://www.gatespowerpro.com/Comergent/en/US/adirect/gates&returnTarget=_top&gotoAdvSearch=false&domProductQueryName=7345%20xl*&CFID=8920243&CFTOKEN=69940025
Look at the first itemon the page, it's the belt you're looking for.
By the way, NAPA carries Gates and if they don't have it in stock, they can usually get it in 2 hours from their warehouse.