Bumper guard bolts

[Enoch]

The lower bumper guard Bolts, I have seen two Styles. Some cars have a recessed head with a captured lock washer. But more cars than not have the captured flat washer. The application for the bumper guard should be zinc chromate. However this is the same exact bolt that attaches the starter brace to the block. And those were black phosphate. So it's possible that they got switched up at the factory on occasion or if they ran out they snag some from that bin