Gates number is K060730. 730 is length in inches, including decimal. So if you need one longer just increase part number accordingly, ie K060735 would be a 73.5 inch long belt, K060740 - 74 inch and they do sell both of these. I've been through a lot of blower belts on my truck since I've changed the pulley sizes many times. Drive the parts guy crazy.
Not that you didn't already know how to decode belt part numbers
