I got mine a couple of days ago. I have Sidewinder's EE-3 and it is extremely close to his bracket size. I had to trim a little of the slot on the stock for it to fit. It's not perfect, but I'm not going to do any more cutting on the stock.
To attach it to the stock, I tried to match the holes on the original, but was a hair off. I squirted some gorilla glue in the old holes and will redrill once it hardens. At the grip end, I put some bondo in the space to even it off, then sanded it. It matches up very well. Unless someone has a better idea, I was going to drill a hole all the way through the grip and attach a bolt of some kind to ensure a tight fit; a little gorilla glue will be added as well. To get a good bond on the aluminum, I'll scuff it up with a grinder first.
Finally, I cut the thumbrest off of the old stock, trimmed it and will probably drill a hole through the bracket and attach the thumbrest that way. I don't trust glue to bond to the aluminum by itself.