I went thru this yesterday and I am still pulling stuff off the new truck to install the overhead cab lights. There is one 18 mm bolt that gave me a problem because of interference. I cannot get a socket directly on it and an 18mm end wrench would be necessary. It's in the middle rear area and retains the middle upper restraint. I left it and leaned the seat forward since I am just trying to get the headliner down in the back. I might add, the design of the seat is terrible for trying to clean the inside of the rear window. The headrests are so close I cannot get my hand behind them. Once again, who thinks of this stuff?