Holley 1920 missing parts - time to swap?

I got floats for my all my 1920's on ebay.....they have 2 weights 7.5 grams and 12.5 grams.....If you can weigh your old float with a gram scale you can tell which one you have.....Probably a few tenths of a gram heavier than posted above.....I have a new 12.5 gram float for a 1920 here but I do not have any of the 7.5 gram ones