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Where have you gone that they keep giving you the wrong part? Take the correct one off and show them. Visit rock auto or ebay website and search till you find the correct one. Not sure how we can help otherwise. Even the autozone website lists the valve and grommet. Maybe yours is not OEM if no one can match it up.
I had a very similar problem. Everywhere I went I couldnt seem to get the right parts for my engine. Turned out that my 92 dakota at some point in its life received a 94 engine. Go there with the part and get them to pull out stuff for years close by maybe?