Stop in for a cup of coffee

Car stuff.
Worked a little more on the car today. There's a couple places where the wiring harness had factory supports that are missing on my car. This surely caused some strain on the field wire and the ignition wire. Hey, ignorance was bliss.
Now I'm looking for any information or pic on how the wires were retained, especially the main harness from the firewall to the brake fail switch on the frame rail.
It looks like there should be a coated metal retainer on the firewall-cowl lip. I'm hoping this is a clip on? If so, ever see one for sale?

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We worked on the younger kid's 65 wiring today... Got some done, need to do some more...

there's a few wire splices under the dash that I don't like... Just twisted together and not even wrapped in tape, open wires... For sure short if it contacts any metal...