Its on the passenger side kinda right behind the alternator. Just follow the fuel rail from the passenger side front injector and it will turn a little out and then down. The shrader valve will have a black cap on it, well it should anyways.
I am sure they would but you would have to know what size, thread and what not to get it from them. I just took my shrader valve out and took it and the other fittings and went to Napa and told the guy what I was doing and what I need and he hooked me up. I love our local Napa. Those guys are awesome and knowledgable. And get sealant for pipe fittings and nothing goes on flare fittings.