Dug out a few of the interior differences, cannot find the original prototype interior though - I believe the first pic shows a custom made wooden one as you can see the original underneath. Looks very similar to the prototype one I remember though.

"Curvy" card - believe this was on very early cars but may be some crossover - my last Aero was an early car (68 I think) and that had the oval one.
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Most common card on earlier S1s with the "oval" section.
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Later "diagonal" as per the GTN.
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Aero 8 GTN #11

"What we do in life.. echoes in eternity."