Steve, I just sent over today the photos of the rear mounts. also the original rubbers. the mounts in the RG&JS are the one on AA4343, they should be in your Email.
Here is a picture of the rear mounts (A-5090-B) in my December '27 Coupe. It has the rectangular cutouts 1/4" from the inside mounting side, which made them very prone to cracking and breaking.