Hmmm. Well, if the bracket comes off but connectors stay put then he is ok and can just replace the bracket. I thought they would have to come off together.
Maybe he can just email/call manufacturer to get new bracket then. I havent seen any for sale at retailers. Maybe one from an older video card would work if openings matched up?
I'd fix it no matter what because 6800 Ultra's are kindof expensive to replace