The plastic 1/4-turn cap used to come in two sizes- large (early) and small (late) on about every Ford V-8 made '60s to ?? Should be available from wrecking yards everywhere as they seem to last well. Our '72 had the large plastic caps & were transferred to aluminum covers in '80; still on the car & sealing well. The rubber grommet for the PCV may be more of a problem.
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