Hemi dart front wheel size?

I see now they don't use the caliper adaptors, oops. I also found the calipers were the 68
B body bendix part # 2823216 for the right and # 2823217 left.
So this leaves us with a special rotor part# 2880514
The guide is calling this a 11.9 diameter. 4.5" bolt pattern right hand 1/2" wheel studs.
The hemi cars used the standard 383 disc brake spindles.
I have never had a KH disc brake set up in my hands before but the hub and rotor appear to be seperatable pieces in pictures rather than a unicast part.
Is it possible they used the B-body hub with an A or B body rotor?
Anyone have a B body caliper to try on the A body KH disc spindle sounds like
it should fit.