I'm pretty sure all the headlamps have the slots on the side to hold the turn indicators.

This is a picture of w126 headlamps
http://img18.imageshack.us/i/sklassezs8.jpg/

taken from this thread:
http://www.benzworld.org/forums/sale-wanted-trade-giveaway/1425685-fs-w126-euro-headlights-bosch.html

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