The back seat is the same for 64-67 GTO/Lemans & Chevelles, Hard tops & Sedans are the same. The Correct Back seat will run the "full width" of the car and touch the door panels on each side. Quick measure check is ~57-3/8" measured at the bottom of the lower cushion/leacing edge) and ~55-1/2" measured at the top of the upper frame (measuring the solid frame of each in these locations, not the spring assemblies)
* 4 door back seats are different (rounded corners on the bottom cushion)
* Most Buick & Olds A-Bodies back seats are narrower (~52-1/2" Measured at bottom front of lower cushion), and use "fancy" thick armrests as spacers on each side between the seat and the side panels
* Base model Buick (Special) & Olds (F85) do use the same "full width" rear seat, but those are getting pretty rare to find
* Convertibles are even narrower than the Buick/Olds back seats
* 68-69 Back seats are different
* 70-72 back seats are different
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64-67 Back Seat Upper Cushion Dimensions:
Upper "Spring assembly" dims:
Bottom width: 57-1/8"
Top width: 55"
Sides height: 21-3/4"
Side height (w/o pinch at bottom corner): 21"
Upper "FRAME" (the rigid steel part) Dims:
Bottom width: 57-1/4"
Top width: 55-1/2"
Sides: 22-1/2"
64-67 Rear Seat Lower cushion Dims:
Lower "Spring assembly":
Front width: 56-5/8"
Back width: 57-3/8"
Sides: 19-1/2"
Lower "Rigid Frame" Dims:
Front width: 57-3/8"
Back width: 57-7/8"
sides: 17-1/2"
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