They are extremely hard to find. I had one fall apart a couple of years ago because of abuse and I was lucky enough to find one locally shortly after with the Gobi Rack for $700. I just sold some extra SUT tonneau hardware I was keeping as spares because a friend was having a hard time finding the parts, all I can say is keep looking and keep your fingers crosssed.
05 H2 SUT, Desert Sand
Hummer X Club Florida Chapter