The true euro's with city light do not illuminate the side markers, or so I believe. To activate here, we jump from pin four of the side marker to power the city lights. I suspect the euro model cars have a different harness to the lights.
I didn't use a special 5W, I simply found one that fit the socket. It is probably too dim. Once things have settled down some I will try to locate the proper bulb.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.