TCE uses the pre-94 spindles for their brake kits. For rear brake upgrades, look no further than the gen 1 style vained rear rotors. TCE kits begin at $1400 i believe, which are 12.2" and should fit under the slicers. This would be a 4 piston setup which includes knuckles, rotors, longer studs, hub & bearing assembly. I believe it's roughly an additional $250 for 6 piston calipers. Add $60 or something like that for directional vaned rotors for the street kit. Road race kit (12.2 x 1.10 rather than the 12.2 x .81 street version rotors) requires aftermarket wheels due to wheel clearance from the wider rotors & larger diameter (13", as would the 13" street kit, though). Core is $200, but i'm unaware whether that's included or not in the price. Please correct me if i'm wrong.
Hope this helps!