Finally got the 1991 awning set rebuilt and installed on my 1976 Ambassador. Shortened the patio and rear window awning. The curb side window awning was the correct length. New springs, seams restitched, new parts and mounting hardware. Everything works. Since the fabric is over 20 years old I will have to be replace it in about 5 years but for now they look great and provide the protection that I wanted. Paid around $900 for the used awnings and parts. It would have cost us over $3300 if we had bought the awnings new and another $600 for installation if we had paid a dealer do the work.
I was also able to reinforce the areas that could potentially fail. Thanks to Zep and Lumatic for their postings and info.