The chevy kit fit on the machined buick spindles ALMOST like I expected. I had a choice of redesigning the mounting bracket for the caliper or finding a way to set the rotor out about 3/16" to make the brakes fit over the rotor. A spacer is supplied with the kit that serves two jobs. It sets the inside bearing (and thus the rotor) out about 5/8" from the original bearing location and provide the surface the seal rides on. I could have had a new thicker spacer machined but I chose to just use some shim washers to set it out a little. Since the rotor sets further out I had to lose the washer for the outer bearing nut and grind out the notch in the nut just a bit. Knowing what I know now I would modify the machining of the spindles to fix these problems. I have a parts car so I suppose I could start over with the spindle machining but I don't see the need at this time.