a "boat seat holder". Yeah I'm not sure what it's called. It's the thing that the seat mounts to that allows it to attach to the seat rails in my boat.

What it looks like is a flat piece of aluminum with one end that is curved. I stand it up to put it in the slot on my rail, and then I can slide to the left or right with my seat. I need to find one, but I don't know what to call it or where to look for it. I tried Cabela's but they didn't have what I was looking for.

Anybody know what the name of this thing is and/or where I might go about locating one?