The upgrade is a mish-mosh of parts. There is a detailed writeup on 323performance.
One of the best suspension/handling upgrades you can do to your capri btw. No more brake fade, front wheels are wider apart so the stance gives you better handling
Parts are from:
-Rotors are 265mm from 89 mitsubishi galant, not the 255 or 276mm. They are 4x114.3.
-Hubs are machined down about 1/4" on the ears so the rotor hat fits over the hub
-longer wheelstuds are installed
-Calipers & pads from a 94 escort, 22v-14 stamping I think, bolt right up
I think thats it, its pretty straightforward. Should replace your bearings while you're in there.