Mercedes W126 Webasto / Bosch Power sunroof motor 0390251699 - fits pre 1986 W126 Mercedes cars!  I have a listing for the 86-91 motor too, please search the site to find if this is the one you need.

Up for sale is a Mercedes W126 Power Sunroof Motor. A-1 Condition. This has been runtested and given a "check up". A very common failure for this unit is a broken ideler gear, or a stripped cable drive gear. If the units screws works their way out (which is also common), this greatly accelerates the wear on the gears... This unit is in great shape! minimal wear on the cable gear and none on the internal idler gear. This one should be good for a while! These are very hard to find in this sort of good condition, and you know exactly what you are getting with this one. The dealer list for these is over $500 (Check, it's true!), and most discount parts places either won't have them or can't do much better than dealer list, as this is made by Bosch with Webasto gears, and they set the price. If you are starting to have trouble opening or closing of your power sun shine, and if it's not the switch, this is almost always the problem. Thanks for looking and good luck!