1966 Dart drivers side front and rear floor pans

maybe you can tell the difference from one of my pictures,

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from my totally twinged dart. it is sitting level on the ground.

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Well, it seems that is a ‘60-‘65 floor pan. Just like this one. Maybe your ‘66 is an early build.

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Here is where I found it.

1960-1965 Dodge Dart Front Floor Pan, LH