Brn, putting the new one in is sometimes difficult. Take you time lining up the edges with the small depressions in the holder where the mirror assembly tips go, then push it up and in.

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87 300e (white/black; amg body kit)
88 300ce (red/cream; amg body kit)
93 300ce cabrio (white/blue/blue top)
93 300ce cabrio (black/grey/black top)
98 ml 320 (totaled @ 137,000 miles)
99 clk320 (black/grey/black top)