Question:Seat/Cargo Boxs

Anybody have the QuadBoss Weekender, ATV Superstore Kit E Box or the Kimpex Outback Cargo Box seats? I understand they’re all the same, made by Kimpex and re-branded…anyway I need the measurements (W & D) for the gas can area. I’m trying to determine if any of the small ( 1, 1.25 or 1.75 gal) Rotopax units could be mounted/stacked in that space…Rotopax publish’s their dimensions…but can’t find the box gas can area dims anywhere…thanks!