Installing Alfine shifter with nexus 8 hub My nexus shifter needs replacing and I don't like the twisting type of shifters so I wanted to use a trigger one with my nexus hub.

Can I use the Alfine SL-S503 with a nexus 8 internal hub?

I think I also need to replace my brake lever so I can install the shifter, what type of lever do I need for the Alfine SL-S503?
Yep, same cable pull for the shifter.

Alfine shifters have the same bar real estate needs as most any other modern flatbar shifter, so you can use pretty much whatever you want that's compatible with your brake, which is its own question that you can find plenty of discussions on here.