Your only real option is the go to a salvage yard. Get your rechargeable sawzalla and cut a 12 inch by 12 inch area around the gas door of a donor vehicle.
cut the same area off your bed (minus one inch for overlap) and put the new one in place--overlapping the new door area over your and tack weld in place. Get all the other hardware from the donor vehicle.
It is not as hard as it seems if you plan on a future paint job of your truck--which i am sure you are--i doubt the new bed fits color-wise.
Just make sure you do like a good carpenter...measure twice, cut once.
SgtDel
OK, Mason lost. Final 4 aint bad, baay beee.