[joyridin']

Mine was a disk unit. The tone rings were used on the disk brake axles. They were mounted on the axle between the housing and the flange for the anti-lock brakes. The housings for the drum and disk rear-ends were the same, but due to the disk brakes, the rear ends were wider.

Forte makes disk adapters as well as North Racecars. North Racecars were cheaper because they made them out of steel if I recall. I upgraded from the factory 10.5" to the 11.66" Mustang Cobra brakes on the rear. Real easy to do. I had 17" rims. Not sure of the 11.66" brakes will fit with 15" wheels.

I bought the axles from Moser if I recall. I ordered them with the disk brake hub instead of the drum hub as the disk hub is larger. The axles were surprisingly inexpensive. I guess people did it a lot.

So, I had the housing narrowed, bought the disk adapters, and put in new shortened axles. Then I had 11.66" rear disks with the narrowed rear.