carb questions

I have a 76 kz 900 with stock carbs. Are these 28mm? Not really sure how to tell. I'm looking for a set of carb holders and want to make sure and get the right ones. Also need jet specs for pod filters and kerker 4-1 header (wide open) Thanks to all replies!

if they are stock (cap with three screws) then they are mikuni vm26's (26mm). the 28's were on the earlier z1's and the later kz1000's.