I'll have to take some new pictures. I'm honestly trying to remember who makes the spacers- I think they are H&R? They bolt to the rotor using the stock wheel bolts. Then the wheels are mounted to the studs using their 19mm nuts.

I had 6mm spacers on the fronts but recently took them off when I had new tires installed. I need to spend some time at the track to determine the handling balance differences. I used to run Yoko AVS tires, so I'd like to do a comparo between both sets of tires and the different spacer options (rear only, front and rear, no spacers).