Are you planning to run dual type wheels or single wheels?
Whatever brakes you use need to fit in the wheels, so check that before deciding what combination of parts you'll use.
Spindles should be the same for both single wheel and dual wheel trucks.
You mention an adapter, like a wheel spacer. If that's what you have try just installing it and see what works.
I think 3B's advice is about swapping a complete dual wheel hub, not using your existing hubs.
Last edited by Grigg; 01/11/2014 6:54 PM.