29" between, but that doesn't really mean much for you since the light mounting bar angles inward as it travels out. There's about 16" across the face of that bar, where your lights would be traditionally mounted.
I just snapped this to help you visualize a little. Those 3 lights measure 22" outside to outside, and while there's a slight amount of overhang I don't think they look off at all. If you were to mount a 20" bar flush with the face of the bumper I think it would fit very well without much, if any, overhang.