Looking for examples of 3 Point Seatbelts in 1964 Valiant

Thanks for the visuals. I am wondering if that mount would work on a pillar-less model like my hardtop. Curious why you went with that mount point and not on the pillar?
I have '64 Signet. I was researching this topic earlier and looked at the way 3-point systems work in convertibles, since they have no post. Most convertibles mount the pivot on the area above the rear door panel. On a hardtop, this can easily be reinforced and is easily accessible. In addition, with the side glass all down, the belt is not hanging in the open space.

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