I used these on each side of the rear deck in my Seaark. They are from Fin Addict Marine in NC. Very reasonable prices and quality work.You can get the custout dimensions that they fit and I think they also give total size but I havn't looked there in a while.
They will also do custom size doors, gloveboxes, anything you need.
2015 Seaark 1872 MV CC Etec-90
Two Helix 12 CHIRP SI's, , MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner