It would help to know the thread pitch of the shock
Lots of aftermarket shocks are different threads than stock so I doubt it would be too big of an issue finding a solution.
I have Ground Controls on my Bilsteins, its really nice being able to adjust them in the car. They have over 40k on them without issue so they hold up really well. If I was in your boat, I would just call ground control and see if they can supply the correct hardware with their plates. They are a great company to work with for custom stuff.
I went through this not too long ago man. I couldn't find any that had the right pitch, I just ended up using a helicoil with the IE camber plates since there's enough metal to drill out on their top nut. It was a little nerve racking but with a drill press you don't really have anything to worry about.
I'm not sure why you think that the weight of the car is on the 3 bolts, they are simply there to hold tension on the mount. When you loosen the nuts the 3 bolts hang completely free in the car. The weight of the car is sitting on the mount which sits on the btm of the shock towers, just like stock...
It's probably the best camber plate that I have worked with on this chassis. Its got a ton of adjustment and you can do the adjustment without removing the plate from the car. These things take a beating and are still tight with no noise, and I drive on these a TON!
I didn't realize GC had 2 different plates. I was under the assumption that these were the only plates they have.
These mount on top of the strut tower and have the nuts on the underside where the top mounts would normally sit. Having scene these other plates from them as stated above I'll more than likely go this route.
Edit: I'm just worried since these seem more street oriented than the other offerings out there.
Think I'm going the GC route. Anyone have some opinions on these?