Hope this helps. As you can see, the new regulator is a smaller frame, but holes in the door allow for this fit. Its also a pretty crude design compared to the original. But also the new one appears to be the correct one. The gear stop, etc all line up as they should for a driver's side front window.

But here you can see how the motor must mount, there is no other way. And with the new one, the third bolt is outside the frame.

Attached Thumbnails

   

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car