IOPort Racing camera mount - used one for years - Poly-U shock bushings, very adjustable (you should be able to mount on an angle like the x-brace and still get a flat shot).
Amazing product for the price ($109.00)
Give them a call or shoot them an email with the rollcage pics, and they will clarify 100% if it can be used.
I ran with a Canon DV camera on it - used it in my Supra (custom 4-point) and my Z06 (BK harness bar) - it's got a standard camera mount so anything will work on it. I taped up my bars where it clamped just to prevent any possible damage.