I have an MY00 classic and had been looking for a Prodrive backbox for a while. I never found one but got hold of a newage box after reading that the only difference was the one hanger on the pipe section. Took it to the garage I use and they just heated the hanger and twisted it round 180 and it fitted perfectly. Didnt even need to cut or weld it. So if any classic owners cant find a classic box try a newage one. I put a pic in just to show where it sits once fitted.