I need to replace the rear trunk (rear section..) floor, and see there are at least three suppliers of pre-formed panels... are they all equal?? Anyone had experience with more than one?

I've done an A.A., and a Restoration Design one and there is no notable difference. You can figure on ANY aftermarket panel needing some persuasion

I designed the original replacement one and after Bill stole my tooling had to redesign so made it longer towards the front. The design is for 70-74 only but can be used in the 76 by modifying where the bumper shocks fit.