On my 90 300e, I didn't need to remove the lever that controls the mirror. If you haven't already done so, you will need to remove the small cover that is directly behind the lever for the mirror and above the door panel, be careful, the plastic pieces that hold this on will break easily. Also, did you remove the bolt (behind the plastic door trim)that attaches the door strap? There are several hooks(clips)that hold the door panel on, and the panel must be slid upwards or you will break these hooks. Please keep in mind, I'm not a tech, but I have given some info on the lessons learned from removing the door panel on my 90 300e. Hope this helps.