8.75 it is, now i need to narrow it HELP

the 7.25 rear i have thats out of the74 dart is a BBP rear, 10 inch drums, and the backing plates are 5 hole and look like a direct bolt up, as their bolt up to flange pattern looks the same.

i measured the 74 dart V8 7.25" axle flange to flange and it was 51.50" and the drum width was 4.50"
i also measured the 67 cuda slant 6 7.25" axle flange to flange. it was 53.50" and its drum width was 3.0

i can only assume that with the wider drum brakes on each side on the V8 7.25" rear the axle, that the tube was made narrower than the /6 rear to keep the wheels at the same track width with the wider brakes. both of these rears are granny fresh, and dont show signs of being messed with, or swapped.

the previous post talking about moser doing a shorten on a c body rear sounds reasonable. i looked at their website, and didnt see anything about them offering this service. i guess i need to probably email or call them.

thanks
matt