I bought a china special, belt grinder/polisher/sander on line a few weeks back. This unit takes 2"x82" belts. 2"x72" belts are a lot more common for this type of sander, so i am having a hard time finding the belts i need. I want belts with 320, 400, 600, 800, 1000, and 1500 grit but the...