Hemi dart front wheel size?

No, the authenticity guide list parts for some b-body bendix parts being used but it is in error.
Long discontinued special KH parts were used.
The B body #s are Bendix made parts and are not compatible with the KH spindles like the guide would have you believe. Rotors are to large to be correct also.
I have seen 68-69 B-body disc spindles and brakes put on an A body but the parts are expensive and not correct so it is not a good option.