Not sure if you want to do this but what about swapping the entire door from 87+. Not that I really care if he cut his panels. It's his car to do as he wishes, I'm just providing options in case he wants door speakers but doesn't want to cut the doors.
As for the rear speakers, take a look at the newer foxes. The speakers were relocated. The original poster was talking about fabbing a way to move the rear speakers but what about getting newer rear panels and seatbelts and relocate the speakers that way. I know I found an article about interior swaps a while back and it mentioned having to relocate the seatbelt anchor since the seatbelt openings were different on the newer cars. Just another option to help it look factory vs. custom rear enclosures.
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