Greetings....Here are photos of what I saved from the original axle limiting cable of 6S299.
In one image you see the dirty crimper and what appears aluminum. In the other photos it shows that it is actually copper.
This discovery (few years ago) was to my surprise as I always assumed they were aluminum. I bought new cables from Shelby Parts & Restoration, probably in 1999 and never installed them, and they included aluminum crimpers.
My apologies if the photos do not attach. I'm not confident with my use of tech things.
Gary C. Bergman