I just replaced my regulator on a similar car. What I did was slit around the door starting on one side going down and over and then up and then I skinned the cover off the door whit a blade and then once finished glued it back on and taped the slit.

I used rivets not bolts just o keep original. The rivet gun was only $12 and a box of rivets for $4 which I have only used 7 out off.

There are some places that may rent you the rivet gun if you don't want to buy it.

I am not sure of what position you are talking about, I moved it around until I got the best position to pull that darn broken regulator out of my door and slip in the new one.


Good Luck

__________________
1993 400SEL (W140) 281K
1999 S500 (W140) 163K (Sold)
2002 S500 (W220) 72K
1999 S500 (W140) 88K
You cannot simultaneously prevent and prepare for war.
Albert Einstein (1879 - 1955)