Thank you for the quick reply especially about the carbs.
OK I have one Super XLAO with the plunger and NO RETAINING NUT like shown in the schematic you posted. I have one Super XL Automatic with all the hardware less the plunger, it has a plug that is shown as an option in the schematic. So to add the plunger I would need the retaining nut. My XL-12 also has the plunger with the retaining nut but all the schematics don't show the nut.
I need a plunger for the one in the 2nd picture, it's broke and held in with a set screw above the throttle.
I want to add a plunger to the one with all the piping and hardware but need one with the retaining nut.
Thank you again!
UPDATE I did find the plungers I needed!!!!