Electrical supply, Summit in bags of 10, Lowes, Home Depot, a gifted hardware store all have those. I have a box full.
If it was easy here, I wouldn't have posted. I am set though, got some from the truck supply company, but all of the hardware and Fastenal ones were 1/4 inch mounting holes. To be honest, didn't try any electrical supply houses, but Summit doesn't sell them. Even called, all 1/4 inch mounting
Thanks, you guys saved the day, mission complete