Thanks to everyone who replied.
I have an upholsterer who can make new covers.
I made a call to him tonight.
Dan: I understand the concept of supply & demand, and agree with it.
If I wanted leather, I could buy the front and rear seats from Katzkin for 800, but I don't want leather, and I only have front seats (in a 1957 Nash Metro).
I guess I'll have my upholsterer copy the pattern in the material I want.
Thanks again everyone..