Forgive me but I am not sure what you are asking.
Are you looking for a place that sells the cloth?
Try lebaronbonney.com
or
http://www.smsautofabrics.com/Are you looking for the finished panels?
Have you tried the obvious places like
Classic Chevy
Bob's Impalas
I didn't think they put cloth in a convertible. I thought that they were all vinyl.
Hope this helps