Are you SURE you checked?? Well anyways here are links for 5 lug swap info:
http://www.nissansilvia.co.nz/tech/5stud/5stud.htm
http://www.zilvia.net/f/showthread.php?s=&threadid=8708
That has the stuff you need to get. As for buying them, look at the For Sale section on the forums. I might be selling a full swap, but I'll let you know.
As for LSD, just type in LSD in the search and many things will come up...NO DOUBT! Places that sell (there are more than this!)
www.phase2motortrend.com
www.enjukuracing.com