66 Barracuda rear disk setup

Hello All,
I am more of a reader than poster but I'm a little stumped right now and need some help. I'm converting my 66 barracuda to rear disks with a 8-3/4 rear end. I'd like to stay with the SBP rotors and keep my 14" rims. I would prefer to purchase a kit but can piece it together with some guidance. I've seen in the past a couple of kits online that converted the 8-3/4 to small bolt rotors and calipers that will fit in the 14" rims but I can't find them now. I've looked on Dr Diff's site and all his kits are for BBP setups. All the other kits are 11" rotors and require 15" or larger rims.

I already have the front disk setup for SBP, power brake booster, proportioning valves and can bend all the new brake lines. I'm hoping to swap over all the brake system soon at one time.

Any help is much appreciated.