Have borrowed Alex's cables to compare with the original C15 cables.
The fitting which is clamped around the original cable guiding the cable into the brake back plate may well be reusable. The other end should fit in the chassis bracket. I could not test fit that because part of the old cable is still rusted in there.
Like Owen said, they are a bit longer than the original ones. I do have a concern that the end which protrudes into the brake drum is too short.
If I cannot find the
original Part no. *1799285, I may end up taking my old cables to a local shop where the manufacture control cables. They said they can manufacture practically any cable, sometimes even using part off the old ones.