Well I guess GM varied in their placement of the medallions.
I measured from the same place you did Dennis, and this for sure is the original back seat.
Wonder if anyone else has another measurement for their back seat medallions?
__________________
Rick
69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.)
69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan
Don't text and drive.
Somebody's life may depend on it!