[Red Box Rebel]

Question:

Can the front disc brake spindles used on the 1968 GTO with 4 Piston Calipers, also be used with the '69 and later Single Piston Calipers? I know the caliper mounting brackets are different, but are the spindles the same, and if they are not, can they be used with both the single piston and four piston calipers?