4 piston calipers ?

I know ssbc makes 4 piston calipers and older A bodies had the 4 piston calipers. My question is, does anyone make a bracket to use the 4 piston calipers listed above on original equipment 1970 ebody disc brake spindles. Or are there any aftermarket ebody drop spindles that fit the above calipers? All the kits I see use the original equipment drum brake spindles.
Thanks for any & all information.
Author: 1bolt@atime