What runflats are you using?
(I think all the 8 bolt rims came with the magnesium versions)
I personally like the 12 bolt versions the best, thicker face plate and easier to cut the centers out of.
The 24 bolt versions are beef also but that's a lot of bolts to torque.
That is re-centered to 3.5", thats the best you can get on the 12/24 bolt versions (not sure about the 8 bolt, I cant cut those on the waterjet due to the rim construction).
I went with the pressed centers over flat for strength, 1/4" thick center makes these boys pretty heavy.
I actually did that all by eye with just 3 c-clamps, a straight edge and a ruler.
It balanced out with about 7oz of weight.
Feel free to browse the pic's I took:
http://s149.photobucket.com/user/tadsal ... /HummerRim
I still have not finished this project but if I do I will use the PVC inserts, cutting the runflats down is a royal PITA.
I got all my centers, o-rings and valve stems from Trailworthy Fab.
http://www.trailworthyfab.com/