ROR-EYE
I picked up the base and post at Wally World and don't remember the brand. I actually have the base mounted upside down. It's ment to be mounted down through a hole in a bassboat deck. I had to enlarge the mounting holes as they don't quite match the holes in the frame.
I car top mine so removing the seat makes it a bit lighter.

Have you looked at the photos of my rod holder? I'll find them and bump them back up.