Two clips across the top and two more at the bottom. Usually with aging plastic the clips break off. Only remedy is a new door or a good used one from the boneyard. Problem with boneyards is you will find all kinds of right side headlight doors but left side headlight doors are few and far between. Seems most of the wrecks are driver's side front impact.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.