found a bed off of a 75 chevy. Going to swap it to my 84 gmc. You fill the gas tank on the drivers side on the gmc. On the 75 bed it is on the passenger side. I don't need dual tanks and I don't want to cut a hole in the rust free bed so I can probably buy a brand new tank for the other side and run lines to it and just take out the driver side tank. Does this sound correct?