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Seeker -

If you add your location to your profile, you may get local/regional recommendations for vendors.

As for the leaning post, many Outrage owners have re-used their posts and installed a leaning post top.

Whaler does not have anything that will fit.

Todd makes several good benches.
Look at the choices at:
https://www.defender.com/search.html?...+leaning+p
or
https://www.westmarine.com/search?q=T...lang=en_US

Birdsall Marine makes a backrest insert that has arms that fold for great storage.
https://marineproducts.net/folding-ba...d-holders/