I'm currently using my old Heritage / Fatboy bars on my 1995 1200.
It gave me an upright, wider handle I was after. My dimensions are:
Width grip to grip= 33"
Rise = 8"
Pullback= 12"
I had no problems using the exisiting controls for the change. You may want to check your cable lengths to confirm that on your son's bike.
They look unsymmetrical for a narrow glide. But it was all about rider comfort for me.