Anyone know the thickness between walls inside the rod lockers? I suppose I could take some large clamps that will reach across into both lockers, clamp them shut, mark them, loosen them and then close them back to the marks and measure. Got some stuff I'm wanting to mount to the interior walls of the rod lockers, (Garmin GLS10 Box) and want to use the largest/longest screws I can to ensure it doesn't jar loose.