See attached, this might help some... two versions - AM early vs AR later. The same springs were used on the GT350 and the GT 500's.
A section of one of the Ford Master Parts Catalog (MPC). I think you need to be looking at the "Competition Handling" listings. Reposted with those listings highlighted.
Note the early version had the spring band strap with a more Round hole and the later with the square hole. Also, ends of spring leaves are not square but a kind-of rounded.
There are a number of threads on this site regarding the finishes on all of the different components that make up these rear spring assemblies as well.
A section of one of the Ford Master Parts Catalog (MPC). I think you need to be looking at the "Competition Handling" listings. Reposted with those listings highlighted.
Note the early version had the spring band strap with a more Round hole and the later with the square hole. Also, ends of spring leaves are not square but a kind-of rounded.
There are a number of threads on this site regarding the finishes on all of the different components that make up these rear spring assemblies as well.