3 holes for a Swinger trunk emblem?

OK so this is confusing,,,

I just looked up the emblem on Year one and the trunk emblem listed for 1970 has 4 studs not 3....

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If a swinger emblem fits in the 3 hole pattern you have then the "dart" emblem could have been put on with adhesive. I'd test fit a swinger emblem in the holes you have and see if it fits and go from there.