Get the napa part number, which will be very similar to "2080802", and either go to napa, or simply google other part numbers in the size you need.
For example: My Gatorback belt is 4080780. Which is 78.0 inches. I was looking for something a little shorter as well and started typing in numbers on the Summit website and came up with one. Here's all I did.
4080779
4080778
4080777
4080776
4080775 <----- This is one I got a hit on, and it fit's much better. 77.5 in.
4080774, etc, etc.