GAS CAPS

I'm interested in the green one, or maybe the chrome one. Can you measure both for the distance between the rubber gasket and the bottom of the ear that secures it to the filler tube? I need one for a 69 Dart and there are a lot of different caps but only one that fits right.
Here are some pics on how they fit on our 69 dart. Assuming my filler neck is original.
Looks like 5/16ths on the measurement. See pics.
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