63 to 66 Positive and Negative Battery Cables

We are looking to add the 63 to 66 positive and negative battery cables to our current product listing of OEM correct battery cables. We have sourced samples of the 62 to 65 B-Body cables and are currently working on sourcing the A-Body cables. A gentleman has provided us the positive battery cable from his 66 Barracuda, but he felt that the negative cable was a parts store replacement piece. As with our other cables, we manufacture the cables to be as correct as possible and are licensed through the Chrysler Restoration Department.
In researching this project, we have found that the 66 A-Body V8 cable is a one year only cable. Can anyone verify that this is indeed factual? Just because the parts books list the same battery cable for the individual different years, does not mean that is how the cars were equipped from the factory. What we need to find out is the differences between the different years. The parts manual tells you the wire gauge and length, but you will see the same negative cable part number covering over a ten year period and varying from 28 inches to 38 inches in length.
Any input on this subject will be greatly appreciated. I will gladly purchase excellent used samples that are documented as to fit and application. I will also offer a new replacement as well for the use of good usable samples. Please let us know what you have and your feelings on this subject as we would like to have these available for the upcoming show season.
Anybody that can assist can drop me a message for my contact information. Thanks for your time and assistance.