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My rear marker feel off my 1979 Volkswagen T2 Kombi. This is a common problem as the plastic tabs get old and break after 30 or so years. I bought some expanding wall plugs from the local hardware store as a quick fix.
It was really tight getting in there, to hold the plastic expander in place in order to screw the screw into it, because of my second battery.
All in all I got it with the help of my friend doing the screwing and me holding the piece in place from behind.