Installing a side marker
 

Hello. I am a new owner of a 2000 S80 with 82K on the odo. So far the car is great, except I have a small problem...a few days ago my left side marker next to the headlight fell out while I was driving. I order the part and tried to install it but for some reason I cannot get it to fit all the way in the housing unit. Do I have to remove the headlight before installing the side maker? Or am I doing something wrong? Thanks.