Here's a picture of three starter cables I have. The top one came from my Oct 18, 65 San Jose build HP Fastback, the middle one from my Oct 15, 65 San Jose build "A" code Hardtop, the bottom is a repro, marked C6DF-14431-A. The upper two are marked C5ZF-14431-A, which are 65 cables used on 66 models, probably to use up inventory. The main difference is the C5ZF- uses 2 integral brackets to attach the cable to the RH engine mounting, the C6DF- use one.
Note the molded connectors.
Note the two different types of lugs on the upper two original cables.
Note the lower repro cable's lug is "similar" to the middle cable.
I bought the C6DF- cable with the intent to remove the woven insulator and use it on the middle cable then install the cable on the HP. I could not get the insulator off. I took the easy way out, used a repro C5ZF- cable.
Jim