Tail light lens

cudamark said

It's a different light altogether. Similar in appearance, but, the S.W. lenses are held in with screws from the outside, where in the other models, the light assembly needs to be removed from the car and the lens screws remove from the back side of the housing.

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True for the taillights for sure - not sure I've seen a '64 Dart wagon with backup lights.
My '64 coupe has the backup lights in the trunk lid - my '64 wagon doesn't have backup lights.

Looking at the backup lights, I'd be concerned trying to get those into the wagon tailgate, that they'd interfere with the rear glass raising/lowering.
Maybe get some and put them in the valance under the bumper?