For what its worth, I had the heads turned down on the NAPA 641-3131's and I installed them - had to use the impact wrench to pull them snug to the hub. I did order the one's that BeyondloadedSE recommended (641-2169) - they were the same dimensionally as far as the head went - so I chose not to use them and stuck with the 641-3131's. I am using only 3/16" spacer so I initially wasn't expecting the need for longer studs. The Rev Model X wheels appear to be considerably thicker than the stock E0 wheels through the center. But, everything is installed now and it looks good (at least to me). Thanks for everyone's input.
