Rich I thought you could post the answer on here. I know from the site you can't put an old trem into a 03 guitar with the new ones. However, can you swap the new ones?? Was wondering because I have an Edge Pro II and it doesn't have the arm holder on it and my bar keeps loosing grip. Also I was thinking the saddles would give you an advantage on the Edge Pro. Any opions to this?? I was thinking og buying a 3120 next, because of the direct mount/pickups/trem all being better. Wasn't sure if you had any Pros/Cons between the two trems now that they've been out.