When you'll strip the interior, you will be able to see what was the colour at the origine because, the full frame was paint. I think about behind the vertical backseat carpet for example. if you look carefully inside the door, you also can see if the red is everywhere like the pictures you posted seem to suggest. Anyway, if you take off the dashboard, under, you will have the paint. Unless the colour change was very high level, there must be the original colour. There is an other place where the paint is original is inside the tail light compartment... If you take picture of the car next week, please send us also the body number, that would be interesting to know. Thank you!