I'm doing some mods to the rear of my softail standard and my question is that a workmate of mine is selling his duece rear wheel/tire and pully. Will I have to do any mods to the axle? I'm getting a 7 5/8" strutless rear fender from Wilwaukee Iron (slim Jim) so fender won't be an issue. I'm just wondering if i'd have to replace the axle or spacers. Thanks,