Brake shoes help (8 3/4 BBP)

Unfortunately, I didn't snap enough pictures before leaving the garage for the day.
The drums look the same as my 7.25 rear. The backing plates are definitely different - the tabs are raised higher and don't allow the wider 7.25 shoes to seat properly.

I don't know what the 8.75 came out of but it was fitted with Moser big bolt axles before I got it.

EDIT: I just looked through some documentation and the rear end supposedly came out of a '69 Charger.