2wheel-lee I am located in Torrance, CA. I also got the s13 driveshaft with my swap, and I measured the bolt pattern on that and it matches the LSD, however, since I haven't received the LSD yet, from the looks of it, the center ring on the driveshaft might be too big. If I end up needing to make the custom driveshaft, Im wondering if I can grind down the protruding ring to have a flush fitting on the driveshaft and lsd. Anyone know if that would affect them negatively?