I installed driving lights on the RT. I modified the mount by grinding the fins flat on one side, then drilling and installing an M6 mounting stud.
After some trial and error, I'm pleased how they are mounted on the RT. I purchased heavy duty 51mm stainless band clamps which were slightly large.
Adding a strip of bicycle inner tube around the circumference of the fork slider under the clamp as a shim made them perfectly sized.
The lights are nicely rubber mounted and very secure. They don't move. And, they are very bright and hence very conspicuous in Austin's dense city traffic.