Here is a pic I found:
http://catalog.peachparts.com/RenderScriptTemplate.epc?_cmd=epccat_VehicleAAA&cookieID=2GS14GK6B2GS14H3O3&yearid=1991%40%401991&makeid=MB%40%40MB%40%40X&modelid=300%2DSL%2D001%40%40300SL&catid=O%40%40Body+Mechanical+%26+Trim&mode=PA&subcatid=O2064@@Trunk+Strut&source=www.peachparts.com&clientid=catalog.mercedesshop

In that end opposite the ball end, you can use a small hokk and that clip on the end will pull away a fraction of an inch, then the end will come off. You might have to push up slightly on the trunk lid so it will come off.
Gilly

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