Thanks for the info, Mastershake. As I've been slowly restoring my Cuda, I've found that VERY few people actually know what is correct for various detail items on E-Bodies. That’s why I’ve started taking a lot of pics of unrestored 70’s so I have some evidence for what was used, and how it was applied. Very time consuming, though…

Does Frank's kit have the long sheet metal screw from the first pic with a separate washer, or the shorter screw with an attached washer? Or both? What was on your car originally?

I’ve found that LA cars used different fasteners for some of the applications on the car, which is why I’m hoping someone has a pic of an unrestored LA Cuda. The valence screws could be the same as Hamtramck, however.

Regarding the backing plates – For cars equipped with a Dana, the backing plates were grey phosphate. Not 100% sure on an 8 ¾ differential, but I have a pic of Dave Walden's 70 Challenger and they appear to be bare steel. I know these backing plates were NOS. See below.