What kind of O-Rings to get? What else do I need

[Trizon]

I just bought some FIC 650's, and like a dumbass tried to put them on without reading the box saying to remove oiginal o-rings.. Anyway, What kind of o-rings do I get, is there anything else I need to purchase along with the o-rings to make them fit? and where do I get this stuff? -- thanks in advance!