I wanna replace the rubber seals on the valve stem cuz the guy told me it would leak if you don't replace it. But i couldn't find rubber seal so I thought replacing the whole valve stem be easier and i was wrong .I need my L-shape valve stem for my 18's. I went to lots of auto parts around my area and had no luck. I try pep boys, autozone, advance auto, walmart, just tires and etc... none carry it . I try looking up on ebay and no luck. Help me!