The blinkers are held in place by a clip...if you shine a flashlight in there, you can get a better idea. You have to depress a plastic tab, and keep it depressed, while pushing the blinker out. Remember to unplug the wire running to the bulb/socket. Once the blinker is out, you can simply remove the bulb/socket, and put it onto the new blinkers, and reinsert the blinkers. I was a little afraid to break the plastic clip/tab...but it should be a fast process...and it is quite robust...afterwards, make sure the blinker is in place...you should be able to hear the clip "snap" into place while you push the blinker in...this is pretty much all there is to it...

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1995 black pearl/black Mercedes-Benz E420 :