A good, solid parking light/turn signal indicator housing is somewhere under all of that undercoating / sound deadening material. Nothing a bit of chiseling can't solve.
It felt a bit like archaeology at the Roman Forum, but I uncovered some relics:
Blue over spray on the indicator wiring and and marginally argent galvanized semi-reflective housing interior? This can be improved..
Electrons do not flow well through the green terminals.