Fuz, thanks a lot for your replay and input.
But I'm still near 100% sure that this "light blue" is original. The interior have never been repainted before. I've checked behind panels, parts of panel covered by other panels, under the dash and several other places. All these places have the same light blue color. But the seat covers have been changed before, and do also have the same light color. So it seems like someone have produced interior with this color earlier.
Second, If you read the further down from tbird 430, you can see that his parents had exactly the same experience as me when ordering interior for their XA colored bird.
Third, the picture under is found another place in this forum and shows a car with light blue door top cover and new darker panel. This is what my car will looks like if I use the new covers without painting them.
So I still believe two different blue shades have existed
Regards a confused,