I know nothing about the W111, but the holes in the chrome piece are beveled to accept countersink or oval-head screws and the holes in the door piece behind appear to be the very same layout as the holes in the chrome. I'd suspect it just screws in there, but as I said, I'm not familiar with the 111.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]