HALP!! Brake parts needed asap!

Hey guys! Long time no see!
Vehicle: 1994 Caddy Fleetwood
Issue: Cant find rear brake parts
This car had an SSBC rear disc conversion at some point in its life.
The drivers rear caliper siezed and wore through the pad, rotors were rotted anyways.
I contacted SSBC, parts are atleast two weeks out. Fahk! This thing is on the lift at my work right now!
So, did some research(not enough obviously), ordered a full conversion through Summit. Right Stuff Detailing. Overnighted the shipping, total cost to me today $455.00. Cool!
Well of course I rushed and the damn lug pattern is different!
Th overall diameter of the rotor I need has to be 11" to clear the caliper. Stock 9c1 or SS rear rotors are larger than this.
Does anybody know of an interchange with a slightly smaller overall diameter that would bolt up to the rear of this thing!?
Any help would be greatly appreciated!
Sincerely, distressed Paul.

Paul
If the original SSBC kit used stock Impala ss rear disc brakes to add to a fleetwood, then you can get loaded calipers, and rotors from Rock Auto. The loaded calipers I got from them not only had the pads, and guide pins, they also had the mounting bracket for the rear calipers. Took a couple days to get them, but I am sure they offer overnight delivery if you order them today.
calipers
rotors

The calipers, pads, and rotors are all SSBC. Ive ordered stock rotors which are too large, and the stock Calipers dont work because they must have an integrated parking brake