The Rekluse dual handbrake kit is great for busting combos, or racing your supermoto.  It allows the rider to control the rear brake from the left handlebar position, while retaining the use of the factory foot brake.  Great for circle combos, straight line combos, or railing right hand turns on the track with your foot out.  The kit comes with

Handle bar master cylinder
braided stainless brake line
adapeter for foot master
one finger clutch lever

a must have for any stunt rider!!