You guys should really consider these before studs. I ran them with a 1/4 spacer on Buick Regal -T and they were great. IF you find you still don't have enough thread then get studs.
http://www.jegs.com/i/Billet-Special...oductId=757188
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TransAM Depot The Judge GTO Coupe prototype, DUCATI ST4s DP, Buick Turbo T WE4 not stock.