They are available from Drag Specialties

KILL SWITCHES
Billet aluminum safety kill switches for the aggressive street rider. Assures instant engine cut off should the rider become separated from the motorcycle.
Pingel's high quality patent panding chocks, have a trademarked cross bar design as shown in the USE. They are available from Drag Specialties, Parts Unlimited, NEMPCO, Tucker Rocky, & White Bros. See photo to confirm Pingel high quality product.