Hi,
I have been looking at those and the more I look the more I think those are the way to go. But can I get ones only 4 1/2 inches long?
These are very close, but is the 4½" the distance between pulleys or the entire belt length (if cut and measured)?
You can calculate the exact size you need
here and find lots of different lengths
here (main page
here).
Remember that you nee some way to tension the belt(s), either by a "blind" pulley, or by being able to adjust the position of one of the pulleys.