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The Ford service stock number is F3ZZ-9030-F. You neglected the "F" in your post. A search on duckduckgo dot com (I don't like Google) shows several other options, and a few additional questions and confusion. If you can, return the cap.Jim
In addition to my previous, there are two filler pipes used on Mustangs in 1970, D0ZZ-9034-A used without smog, and D0ZZ-9034-B used with smog. Because of that, there are two caps used, D0ZZ-9030-D with smog, and D0ZZ-9030-E without smog. Those stock numbers are listed in 1975 "Ford Car Parts" (aka MPC) book. I do not have a cross reference to current numbers. I'm not saying that's an answer, but it "may" be.Jim