KZ1000J carb model ID numbers/letters ?

Where on the carbs would I find the ID numbers to tell what the carbs are ? They are supposed to be KZ1000J carbs

Should be Mikuni BS34 CV type carbs.

I have 1 set of Gs1100 carbs & 2 sets of what I believe are KZ 1000 J carbs, Im just trying to figure out what they are all off of year wise. Thanks for your help. Would you happen to know the center to center measurements on the 2 carb sets ? When I measure from outside of #1 carb to outside of #4 carb the GS ones are about 13. 5 and the others are 13.25 approximately