Posting this update for anyone else looking for these parts... The washers you directed me to in your PM are exactly the ones I need for my sync plug screws. I've gotten the ones from Sirius and it looks like they'll work just fine.
Guess I wasn't clear, though, because I'm not looking for washers for the air bleed screws that have springs. The sync plug port plugs have no springs or o-rings, but I want to have the washers because the ports are a direct vacuum source, and they IMHO all require these washers to seal.
Thanks again to all. RR