i was talking these guys:
if you use these, then the studs on the car can interfere with the wheel when installed if too long. i'm sure you could use normal spacers with extra long bolts or studs as well. i'm not up on the physics of these things, so not sure if one is better than the other. with the method pictured you are more versatile for switching between different wheels with different offsets without having to have sets of different length bolts or have studs sticking out extra far.