The screw that are on the outside of the original lens will only retain the lens and allows the light bulbs to be serviced. In order to remove the factory tail light assembly you need to access the mounting studs that protrude into the body. This cover plate must be removed to access the 4 nuts. BUT while the drivers side was pretty easy to access, the passenger side was behind the built in built in blanket cabinet. Tougher to get at because the cabinet needs to be disassembled to access the cover and tail light nuts and connectors.
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