It's my first post. A few weeks ago, I bought a 1985 GMC Sierra Classic 4WD. The carpet was shot, so I removed the seat to install new molded vinyl flooring, and I found this. Someone sawzalled a hole in the cab floor, behind the seat, and then JBwelded a piece of sheet metal over the hole. The truck is from the south, and the frame is in great shape. The rest of the cab floor looks solid, too. What am I looking at, in these pics? Thanks.