are the 20mm spacers the bolt on type with their own studs? If so, the stock studs are about 21 or 22mm and protruding past the spacer, keeping you from getting a good mating surface.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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