[cbreez]

Unfortunately they aren't supplied with Backdraft, which makes the other four belts about worthless without one.
My suggestion: You will be hard pressed to buy one or two new ones without buying a complete set. Many track racers replace their belts as a routine after 3 or 4 years. I would find a local speed shop and see if they have a trade -in set around that you can steal one from. Also they may point you to a local racer that can help you out. The anti-submarine belt is probably the least stressed of all belts so a used one will never hurt you.