My source of hub-centric spacers was Skulte Performance. They stopped making them. I haven't need one since they closed up several months ago, so I don't know where to get them. You can get by temporarily with a cheap spacer from your local auto parts store. Just make sure when you sandwich it between the wheel and the hub that it is centered. I wouldn't run them at the track though.

Studs are 12mm-1.5, with an 0.509" knurl. Measure your stock studs and get one at least 1/4" longer. Someone told me the front hub and rear hub studs are different length. I have no way of checking that, since my stock 10-bolt was sold 11 years ago, and I only have the stock front studs laying in my parts bin. You will probably have a hard time finding the exact length you need, becasue there aren't many available. I run 67mm in the front, but they are too long for stock conical lugs. They are sized for the extra long shank style lugs used on Weld racing wheels.