i had 30 or 35 out back on my ap1 wheels, looked a million times better than stock rode that way for a year never had any problems... had to roll/trim/relocate bumper tab but studs were already built in...i did have to get the wheels center bore drilled out to fit them on the spacer though, some things to think about

 

Im pretty sure I think most 15mm and bigger come with built in studs. I am not a guy to spend a few K on wheels so I took what I had and made themlook boss!