The standard kit includes a split grip twist throttle, which works great for most lever shifters. If your bike uses a twist grip shifter, then you would likely want to swap this for a thumb or possibly left side throttle.
We also carry two twist throttle types that have a button built in, which you can press to engage regenerative braking without messing with the existing mechanical brake system. This is a great solution to take advantage of regen if you don't want to replace your existing brake levers.