FWIW, those guys are local to me. While every company has the odd complaint, the local word is they're ok. I didn't use them.
15 or so years ago, most kits used a spacer on the spindle and a different bearing set on the stock spindle. Then a Granada rotor, turned down to allow the early wheel to mount. A flat bracket mounted to the backing plate location, and either Fairlane or Mustang calipers, for either 14 or 15 inch wheels. Plus hardware and hoses. So all you really bought in the kit was the spacer and the plate. Everything else was locally available, probably cheaper. The spacer moved the wheels out about 1/8 inch. I think this is what the T-Bird guys still sell as kits. Don't quote me, it's been years.
So, if your willing to shop around, you can save the difference.