http://www.dansperformanceparts.com/buggy/bilaa/buggybilaa1.htm
These guys sell some nice ones for a really good price, but I don't know if they have 2". Otherwise, look up "shaft collar" on mcmaster or the like. Mad4wd sells the really nice ones, but they're ~$35. Could make your own out of exhaust tubing and some bolts.
