Its not the prettiest thing in the world, but I had to get something quick because I was not expecting to have such a large hole there.
a quick trip ACE Hardware and I got an electrical cover plate. I drilled 2 additional holes in the plate when mounting. I also used some butyal tape around the edge and where the screws went through
and pretty much used an entire tube of dicor (the small wire going through is the cell extender antenna I added a later date)
2001 Ford F350 LB Diesel 4x4 CrewCab Stick
2015 Wolf Creek 850 Thermal Pane Windows, Oven, Reinforced Anchor Bolts, 200w Solar, Torklift Tie Downs, Fastguns, Stableloads