Tractor supply has a truck storage box for $99 that is a perfect fit for the rear area even with the factory tailgate.
what latches are those and did you secure it the same as the other people are doing with the TS box with the rivnuts?
Had to find something that would fit in the flat space on the box and couldn't be too long in the strap.
I did not use rivnuts, wanted to be able to easily remove it. I use short ratchet straps and the factory anchor points in the bed. Works like a charm... View attachment 1931