For the front:
If you scroll down in this link:
You'll see pictures of cobra front brakes on a 4x4 knuckle. If you can machine out an adapter, it won't be too hard at all to do.
I thought about buying a smaller mill from harbour freight (i've seen some good work done on these), and making a few sets of adapters. It wouldn't take too long to make my money back. unfortunately, school and work have taken higher priority.
Oh, and the gt500 brakes are AMAZING. if anything, i would go with those (if you can afford it, lul).