oh we actually did the exact same mirror install in my dads 124 sportline. Here was a test fit in a 201:



ill try to dig up the pics of it in the 300e. I know the wiring was kinda difficult, but nothing too bad. Oh and dont forget to hook up the shifter illumination led!

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1993 2.6 (040) SportLinE 5-speed - Armed to the teeth w. roof rack/2x bike carriers/8x ski carriers/MB towing bumper
1993 2.6 (040) - deceased/reincarnated as a trailer.
1987 16v (702) - Now parting out(9/22/10)!!! - Email me your requests for 16v parts- Engine and full body kit avail!!
1987 300SDL (122)- For sale!