Fender Application Question

Can anyone tell me if a fender for a '73-'74 Duster would be a direct bolt-on replacement for a '75 Duster?
AMD is re-popping the fenders for '73-'74 Duster but I am not going to lay out that kind of $ for something that would require modifications to suit my needs. I would just as soon buy a decent used one if I am going to have to re-work it.
Thank you