RMS inboard mounts on 72 Challenger questions??

[Monty's 340]

Hey all, looking for some feedback from anyone who has installed a Reilly Motor Sports Street Lynx with the inboard mounting frame replacements? The instructions from Reilly seem a little different from what I am running into. The car is on the rotisserie so easy access, just seems to be missing some content. Looking for info from anyone who has already gone through this, specifically on a Challenger body not a B body car.

Thanks in advance for anyone who can chip in.

Cheers

Norm