I have seen some trucks with both square and round keys, but damned if I know what the round keys were for. I seen them, but never gave it a thought. The only assumption would be for door lock, glove box, or bedside tool box. But, when you order new locks or ignition, only square keys are supplied.
It's taking me time, but now I have some air metal shears on the way. I figure to cut out the wheel well rust and use metal adhesive and rivets to affix the new panel. I can barely wait to get started.