| on a Z32. When I got the details for my brake swap from the guy that did it, Jim at Turbo Toys he said that he didn't have to modify anything on the fronts except the backplates. When I went there this morning to take photos of my setup I asked him about the caliper bolts. The bolts are bigger as seen here. 350 on the right 300 on the left 
He did drill out the spindle for those to slide through, when I asked him why he didn't tell me about that he said he didn't consider that much of a mod. He said he used a 1/2 drill bit and it took about 5 minutes. When I mentioned that someone had had problems drilling that out he said maybe they shouldn't buy their drill bits at harbor freight. And he's right, I took this spindle off the shelf which is a stock 300 and drilled out the hole in three minutes. They are only aluminum. 
Regardless, once those holes are enlarged it is a direct bolt on for the fronts.
The rears however are an entirely different animal. The mounting tabs on the spindles need to be relocated to fit the brembo calipers.
As seen here 
Hope this helps clear up any questions that have been asked.
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Everything you wanted to know about 350Z brembos (long) - 
