[Zeke]

I think drilling it on the car would be disasterous. It is almost impossible to layout five points on a circle perfectly. So why not let a machine shop do that for you? I don't know about the East Coast, but FAT Performance in CA has them on an exchange basis for a little more than a hundred bucks including studs. I really don't see how you could slip them in from behind. See Pelican tech article on R& R hubs.