Replacing Bench Seat with Leaning Post

[RickBomba]

Hi Everybody,
I'm thinking about getting rid of the stock low bench seat behind the wheelhouse of a 21 foot 1986 Seacraft.

I'd like to put a leaning post with rod holders and storage in it's place.

My question is, ho do I go about fastening the feet of the leaning post to the deck of the boat.

Any suggestions about that and also some leaning posts with storage and rod holders would greatly be appreciated.

Thanks!
Rick Bombardier