Don't waste your time with the "Third Gen" rear Disc. I have Two 3rd gens with them. Unless you already have everything, i.e. a wrecked car with everything available. Otherwise they are junk. I drove the 86TA for years with only the front brakes, because the rears would never properly adjust no matter how many times you pulled up on the "Emergency Brake Handle". GM did a recall on them. It was only on the Stick Cars. Automatic Cars...Pound Sand...Just put it in Park. It didn't matter if you got rebuilt, rebuilt them yourself, or took it to a shop. Eventually they would simply stop adjusting. I probably have half a dozen or more pairs that I pulled from wrecked cars, trying different kits, used for cores, door stops etc. I bought 4th gen brakes intending to do a swap, but the car got totaled first. Truck turned in front of me, wiped out the drivers side of the car.