Are they repairable?
My driver's belt stopped retracting, so I sent it off to www.safetyrestore.com, to get it fixed. Shipping it there and getting it back took the most time. So far so good.
Another company I found on in my searching is www.seatbeltplanet.com. I have no experience with them. There website mentions fixing Jeep CJ belts, so other Jeeps were fixable also.
I chose SafetyRestore because 1) they replied first, and 2) the quoted estimate was less.