The caliper is a Ford Tarus SHO 1989ish. They cost about 125.00 USD for a pair with pads. You want these and not the typical tarus because the spring for the e-brake lever is small and will not hit the rear coil spring on the SHO. If it does you need to use an inline cable spring and not the coil type for the lever.
Above is the correct spring on the caliper and top picture is of the larger spring that will hit your rear coil spring for the suspension.
The hose runs about 30 to 40 USD and the rotor I think is a ford Tempo that I had to redrill the lug holes. The iteresting part is the same rotor can be used on the front with a wilwood caliper and an adapter bracket. Back to the rear, you need to remove all of the drum brake down to the back plate. Use a slide hammer attached to the axle and pull the rear axle. There two ways of doing the next step. You can have a space machined for the same thickness as the rear drum backing plate or mark up the backing plate and cut it down to a square as you can see below.

Put the new spacer in and then reinsert the axle and tighten down the four bolts and the caliper bracket. Slide/gently tap the rotor on it is a really tight fit but a good one!

Put one caliper on and hoses. I have not worked out the e-brake cable adaption and the brake tubing for the flex hose yet so that is unknown territory. Right now it is a work in progress. Here is the bummer; a 13 inch rim will fit but not a steel TR7 or a TR8 alloy.
13x8 superlite rim plenty of room.
Michael
1980 TR8 FHC/Works Rally Project
"If it is broken then fix it....if it is not then make it faster!"