I've lost the tag that I had labeling this part. It’s from my ’53 3100. I don’t remember what it’s for. There's an "F" stamped into it. Does anyone know what it is and where it goes?

[img]http://www.wwnet.net/~chevy53truck/MysteryPart1.jpg[/img]

[img]http://www.wwnet.net/~chevy53truck/MysteryPart2.jpg[/img]