On the white bike, they're WRP fat bars. 25mm clamp methinks, and 760mm wide.
All my controls fitted ok, but there are two ways of doing it.
1. You can drill the bars and use the locating lugs on the switchgear.
2. You can remove the lugs and wrap either double sided tape, or as I use, zinc oxide medical tape around the bars, and clamp the switchgear over them.
Tried both options, and tbh option 2 is the easiest.