just sold my 15 and 20mm 4x100 spacers
but i got them from iim, slide on spacers require extended studs, in some cars u gotta press ur bearings out, some u can just hammer the studs in and out.
bolt ons sometimes require u to cut existing studs that stick out further then the spacer that contacts the wheels
dont cheap out on something like this, i ran ichiba bolt on in the rear and cut studs "later got wider wheels and had to put new studs on"
upfront i ran slide on with extended studs.. had to buy new wheel bearings, get them pressed in at a shop.. all said and dont this was a 350-400$ experience, if i could go back i woulda sold my wheels and got a pair of wider or lower offset wheels!.. wich i end up doing