mckackie,
When I looked at your pics the other week I just assumed that the seats were a custom thing. Can you post up a close up picture of the insert. I would really like to see it.

If you want them redone like original, maybe the blue part could be screen printed over a base material as best as you can match. Then you could get an embroider to reproduce the strip zigzag pattern over the top. They can do this with just a JPG file.
I have logos embroided onto business shirts and all they wanted was a .jpg file that was made with a picture progam. From what I know the computer takes over from there and drives the sewing machine. It can get quite good detail.

All up it would be a challenge but worth it because it is so different. The next problem would be convincing the arm chair experts that it was original.