1972 Duster Fuel FIller Neck - Can I use one from 1973?

1972 was the transitional year to a new style fill neck (and new tank venting). Seems that repo's are available for 70-71 and 73-75. I'm not sure what makes the 1972 different from the 1973. From pics on this forum and Google, looks like they mount the same way.

It appears that mine is drilled for both styles. There is a chance that these are not factory holes.

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