What is this bracket?

[68z28kk]

Here is a bracket that was in a jar from the basement of an old Leeds plant employee here in Kansas City. I think it is a battery cable or speedometer clamp. I pictured a used one I took off a Chevy of some kind from'65 to '69 but I can't remember what. A Camaro battery cable fits it perfectly and it has a coating around the loop. It looks like it would bolt to the front cross member and make a direct line to the starter on some car. Any help is appreciated. Clint