I am going through a similar situation. Here's what I have found:
A thread with good info is here -
Seat Cover Replacement
Therein is a supplier of fabric - SMS Auto Fabrics, 350 South Redwood St., Canby, OR 97013. Email is
info@smsautofabrics.com
I contacted Cruiser Corps who has seat covers in a fabric that is very similar to the original. They advised me they could make covers for me if I sent them the fabric I wanted. They told me it would take about 2.5 yards of fabric and 1.5 yards of vinyl for the front seats. If I supplied the materials (about $300 with the prices in the thread above), they would make the set covers for $400. So, the total would be about $700 using round numbers). I looked at the math and will not take this route as having the more original looking cloth is not that critical for me. I can buy their covers for less than $400 and be happy. Cruiser Corps were great to work with in this back-and-forth Q & A process.
The only complaints about the Cruiser Corps product I have seen in this forum is it doesn't have cut-outs for the headrests and other attachment points. That isn't a big deal to me and their logic for not doing the headrest openings is reasonable - not everybody uses the headrests and cutting a small opening is easy and not a cosmetic negative.
Good luck.