on my 87, the lens comes off. I removed the bulb holder inside the trunk, undid all the little nuts, and pulled off the lens. It had been on there so long that it seemed as if it was glued on, but it did come off.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E