The silver plate on top of the gunnel that is. It’s been on since I bought it in 2013, doubt it is from the factory, guy before me did use the boat on green bay and was a warden boat before that (if any of this helps determine). It’s a 2001 pro sport. Im guessimg some kind of track mount or maybe downrigger mount? it has two rows of threaded holes that are spaced just right for the hole pattern width for my scotty rod holder bases, but spaced to far to put all 4 bolts in, just the top or the bottom row. Perhaps this is a universal spacing?
Would be curious if they are spaced right that I could put a track on it, would make a way better rod holder set up for trolling than what I’m doing now