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.
![[Linked Image]](https://i.imgur.com/lp5IRzE.jpg)
Most common card on earlier S1s with the "oval" section.
![[Linked Image]](https://i.imgur.com/AVWFchj.jpg)
Later "diagonal" as per the GTN.