Fish-Hawk.Net

Hi all. I live in the Ottawa area and have a 14 ft aluminum boat and I'm looking for what I think is old hardware to mount a boat seat on the centre bench. I have the track already installed and I'm wondering if anyone knows where to find the plate that fixes onto the bottom of the seat (new or used plate is fine).
See images attached.
Thanks.

That's interesting, never seen that before, good luck with your search.