those orings come in a top cover kit or you can get them in a seperate kit.
I HAVE hit up my universal kit and replaced orings under a option cover i took off before as I was in a pinch and could not run to the dealer. the only hitch is repalce all of them. don't repalce one new fat one and leave 7 old hard smashed ones under there or you will be taking it off to repalce the other 6.
ps. a lil gun grease holds them in place just fine..