rear combi ligth assy for 99 ml 320

to make a long story short it is busted and needs to be replaced. does M-B sell the whole unit and is it easaly replacable or can I just
replace the plastic cover? I only saw 2 screws holding it in position when I open the tailgate. I dont want to get it and see that I need to open up the whole quater panel garbish to put it back in place.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.