What is largest spacer you can use before needing longer studs? Anybody know where to get 1/8" spacers?

 

Paul;

Typically 1/4" max, will work before you need to change the studs. H & R can make any size you want, call you local H & R dealer.

 

PaulP - Even 1/4" spacers may be marginal as far as stud length is concerned. With open steel lug nuts, you ideally want to see the stud fully filling the nut. Some people will say "7 turns" or something to that effect, but personally, I want the full depth of the nut doing it's job. You shouldn't let the replacement of the studs be a big issue though. It is a pretty easy DIY job, and the cost is only about $20 per wheel.