These are throttle, not choke plates. Kawasaki/Keihin has never sold any service parts for them, meant to remain undisturbed.
I'd suggest to leave them be, simply work around them.
But if you so choose to remove, I believe they'll be 3mm, countersunk, stainless steel screws. Allen head, JIS or phillips head...your call.
Length not super critical...you'll need to cut to length and peen them in place over again. Also suggest using red Loctite on the threads.
Should be readily available from an internet hardware specialist.
“Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba....” quote Hunter S Thompson
Custom Carb Service
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Last edited by ducatiman; 1-18-2020 at 3:03 PM.