Fishy-
I believe there was an option in the 70's to add either the stern-mount style livewells, or to place boxes in the stern inside the cockpit. But... that doesn't really help you much now...
The great thing about the boxes- if you set them up correctly, you shouldn't have to use an aerator pump at all. They're very simple and work great.
I could trace the mounting side of my boxes and mail the sketch to you if you'd like
OR
you could probably trace the stern yourself and make them. They're very simple after all... I believe at least one member (REELCLIMAX) has made some of his own-
viewtopic.php?f=6&t=3726&hilit=+sternGood Luck!