You don't have to tell, I figured it out
, but if you hadn't mentioned it we'd never know.
HOME DEPOT.
Danco faucet O-rings, #35, also known to the world outside of plumbing as size #015:
It is good to have options, especially if the home stores, lumber yards, and plumbing supply houses likely all carry them and you don't have to special order from an autoparts store or industrial supply like Grainger, Imperial, Moss O-ring, Motion Industries, Hydraulic Supply, etc etc.