M22 x 30 x P1.0 x H12 Suzuki GP Pro (query this on amazon and see?)
(I hope im right!)
The nut OEM is a 30mm socket size , i don’t expect aftermarket ones to stray too far from that but beware of cheap metal copies , least heaven forbid you strip threads of the yoke tubeand have to replace the whole thing. It is very annoying when the bike goes over little humps and the whole front end judders if the nut is not torque to the right specs (if it says example “40 ft lbs” , then 40 it is, not more , not less. the new nut should handle that too.)
It is for that reason, i don’t use yoke extensions for GPS, i use these instead
Oxford Strap Nav
Buffalo Nav Bag
// Meditation doesn't mean you have to sit still....