Hello 59ApacheGail;

I hope you have luck in your search. I was able to find the correct "Detroit Cloth" numbers at a auto upholstery
shop. With those correct numbers you may be able to source the seat cloth material from an ware house which
specializes in old seat material. This is no promise, but
might be a possibility. Either way I would like to hear how you made out.

Respectfully, Charles