Hi Bubba and
to the forum.
Unfortunately you haven't mentioned which kit you are interested in, so I'm assuming it will either be a Magic Pie 5 or Smart Pie 5:
The control harness for these motors is pictured separately below:
The length of cable between the controls and the four way junction box is approximately 22" or 56cm, which should be more than enough for your 13.5" ape hangers.
The cruise/horn button unit would usually be mounted on the opposite side of the handle bars along with the other brake lever
(not shown in the photo).
I have it mounted
(along with the throttle and brake lever assemblies) onto a piece of 22mm copper pipe so that I can operate all functions with just one hand when I'm bench testing motors.
Alan