B190 Enthusiasts

Was doing the exchange to LED's for the blinkers, brakes... gave up on it till another time. Noticed that 1 side of my 3rd brake light was out, went to remove cover and no screw on right side and screw on left just keeps turning, cover is tight in the opening, don't want to break the lens if I don't have to, just want to get at the bulbs, hints, suggestions / Thanks

Ended up getting the lens out, no screws were holding it, just a pressure fit holding it in the opening, now for new bulbs. Now the power seats...