ebay from importsplanet in champlane ny i'd suggust getting the 72.whatever center bore so you can use a more common hubcentric ring the wheels will center themselves with the taper of the lug nuts as long as you take it slow but the hubcentric ring centering the spacer is key ( or taking alot of time guessing by hand)
i did 17mm front and 22mm rear but that will vary depending on tire size and rim with and offset. when i put my snow tires on (stock b14 wheels) i'll try to remember to take pictures with and without.
for the studs i kinda decided that if you insert and remove the same stud (K.D.) you may be more likely to have the stud spin in the long run and have to weld or replace spindle so i'm not heart broken (or wallet broken) about using the arp studs for the early gm drum brakes or whatever.
i think the thread is 7/16 20 which by the book uses a lower torque.... i got some 3/4 open ended lug nuts for cheap that allow the use of a tool that actually fits into the wheel without rubbing, so the next issue i need to address is getting a 3/4 or 19mm deep socket in my car incase i ever get a flat. preferably somthing that attaches to the stock tool so i still have that for the stock jack. but for the time being i don't even have a spare tire so that's at the bottom of the list.