Good luck finding out what 120 you have. The FZ is the only one I can spot right away. Example is I have the G-NC and F plus an FZ. I can't tell the difference except by the low speed needle on the FZ.
I do have an extra regulator so you can see the gasket and diaphragm. The diaphragm is round and fits under the gasket. At $3.50 each shipping is more then the parts. I also have extra rocker arm cover gaskets on hand plus over the years I have bought the complete gasket sets. For just a one engine owner just a couple diaphragm/gasket sets and a cover gasket should do it.
