I bought a 2017 softail slim s. It came with the beach bars. I'd like to change them out to 10" mini apes. What would I have to change besides the handlebars.

 

You will need the following:

Poly riser bushings
Brake line
Brake fluid
Clutch cable
Clutch release cover gasket
Tranny fluid

 

I agree that those are the things that you will be needing but you have to make sure with the procedure. There are tutorials available online that you can use. goodluck and hopefully you can finish it right.