I found something else that would be the hot ticket if its the correct diameter? And its a factory Ford part! 1957 to 1962 Ford pickup. Run the wires inside a piece of oil cloth wiring loom and it will look like a factory installation. I'm going to buy one right now for my '34 pickup project. Thanks for starting the thread and getting me motivated!
https://www.cmwtrucks.com/product/57...umn-wire-clip/