So you've got the breaker and you've got the panel. With many styles of panels you still need one more piece: the hardware kit. This is the kit that will connect your breaker to the panel. We've got a lot of these available for all sorts of breakers including Cutler-Hammer up to 1200A, Square D PEF style, GE Spectra Series and more. Check them out below:

http://rivercityindustrial.com/breakers/hardware-kits