The headlight you will have to extend the mounting holes on the bracket and it should bolt up no problem.
Floorbaords I think are a direct swap unbolt your foot controls and replace with the boards.
The fenders are going to be tricky. I think the classic is a bit wider for the front fender between the forks. Best bet is to find someone who bobbed their bike in your area and see if they still have the stock fender and try from there.
The rear you will have to move the mounting bolt on top for the seat I think back or forward cant remember but it will bolt on just fine. You could go without the bolt and be ok if you don't have a passenger seat you want up there.