Thinking low end bumper guard. They normally have both sides, these have a single side, but do have a recess at the end with 2 holes. Expect that to have a top cross bar. Round end bolts through the bumper.
This might be right. I don't think they're automotive pieces. And very little marine stuff is chrome plated steel.
you my friend are obsessed with me... LOL... carry on...good find though.. although I did guess wrong, you spent the day proving I was wrong.... but guess what.... the prize was the same...