I have never seen or heard of a any R107 having any sort of powered top. There isn't even a place to put top motors. The gas tank is right below where the soft top is stored.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member