So I got my regulator in from micromatic and everything seems all good except they did not ship it with a nylon washer, can I find these at my local hardware store or something that will work at least?
Double check it. If it has an o ring on the post part it may be washerless. Mine from kegconnection was. It should have a sticker on it is it is washerless.
Otherwise bring the reg to a hardware store (even if they have them you'll never find them at HD/Lowes) and ast the guy to help you. Get a few.
edit:
as stated above the gas supplier always rubberbands one to the tank when I get a refill.