I beleive they come in two versions: unpainted and chromed.
Both are covers to the existing mirrors. You add these on, but do not remove the existing mirror covers.
I did this with an old 300SD. It took some work to get the covers to fit correctly. One side was much harder than the other ... don't know why. I had to bend the metal a bit to get them to work.
The mirror covers attach via double-stick tape to the existing covers.
Hope this helps,
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)