I'm working on a 69 Barracuda. I found a funny bolt that came with the bag of bolts from the front end and engine compartment when I bought the car. It looks like a regular 1/4" x 3/4" body bolt with a captive washer but the bolt head has concentric circles and cross hair lines like a bulls eye and the washer is not copper but some kind of copper color in it that does not come off all way when I bead blast it? Anyone know if it is an OE bolt and where it goes?