Both lights in rhe picture are for motorcycles.
One is 2.2" diameter; It mounts on the handlebar.
The other one is 5.2".diameter.
It's HUGE!
Its present location is too low on the fork.
When I have the frame gussetted, I'll have a nice stainless steel bracket made.
The 5.2" wide light will mount on the frame, in front of the headset badge.