[bbrown]

The difference here appears to be that John is using a Kirkham reproduction Girling caliper and Allan has what looks like a PBR caliper. The PBR has their style of e-brake abutment attached to the caliper and the Girling requires a different style abutment to attach to the upright. It looks like mismatched parts.

The uprights on your car John, do not look like the original or reproduction AC uprights which include a mounting boss for the abutment. They use two 5/16" bolts to hold them on.

I'm guessing you need PBR calipers with Shelby uprights or Girling calipers with Kirkham (or AC) uprights, but without having them in my hands, that's only a guess.

Good luck