[mike mueller]

If you can get the 911 or 914-6 strut assembly cheap enough, I'd got that route, but if not, nothing wrong with the rotors/hubs re-drilled.

For the fronts, any compentent machine shop should be able to modify them, make sure your rotors are in good shape, you'd be pissed to have them studded just to have to replace them for being too thin.

basicly 4 new holes are drilled (you use on existing threaded hole)
then all 5 holes are reamed out, the backside or inside of the rotor is spotfaced for the head of the stud.
(5x130mm bolt pattern)

for the rear, it's pretty much the same. I had a local machine shop do the work for me on the front rotors and the rear hubs.
(cost was free, it just took a few weeks... we use them for work)

for the rear rotors, i just re-drilled that myself with my drill press, no big deal since the wheels are bolted to the hub and the rotor could be a tad bit off with no problems.

get pressed in studs, do not go with screw in studs.......unless the screw in studs screw in from behind like a bolt.....