My Akro was sold as being from an 06 450EXC, so is the older style titanium one. It fits straight on my 09 570, but did need a little messing with angles to stop the rear wheel rubbing too much. In saying that, a quick rub with petrol and the tyre rubber is gone anyway.
I picked it up new on fleabay, as being old stock and saved a fortune on the dealer price (try 1/3 of the retail).
Nice and light, looks the nutts and has a nice sound. I was initially disapointed it wasn;t really loud, but when you press the warp speed button on the 570, you forget it anyway!