Since I have spent hours trying to find a definitive "how to" on the subject, and this is the most common thread that pops up when I was searching "fit ducato mirror" here's my hard-won instructions.
1. Remove the speaker cover by gently prising-out the the 5 or 6 plastic lugs which are just direct push-in, pull-out towards you, then un-screwing the 3 Phillips screws that retain the speaker. Best to un-clip the speaker wiring at this point, (it is fool-proof) and put the speaker aside, so that you don't drop it later when re-assembling....I did...
2. Remove the interior grey plastic trim around the front quarter-light window by gently prising-out the leading lower vertical edge with a flat spatular or knife. There are 2 pin-type plastic lugs at the bottom of the leading vertical edge, and then there are another 2 spade-type slip-on retainers that must released by prising towards you, and the trailing edge has another 3 of these spade-type retainers that need to be released by pulling forward, not by by pulling towards you, other-wise they will break-off! Experience!!
3. Remove the electric mirror switch panel, by gently prising the middle of the trailing edge of the panel, dig deep ( there is a single plastic spring-clip holding it in the centre, and the plastic grey surrounding trim is surprisingly soft, and bruises easily, so use a paper or card-board buffer to lever against), and then you will will find there are 2 plastic junction sockets just below. Unplug these.
4. Using a Torx driver, (# 20?, can't remember) undo the 2 screws at the very leading edge of the door, and then also the the 2 Torx screws that were behind the grey plastic trim, so a total of 4. If you are doing this with the door open, the mirror will remain without falling, but as soon as you close the door it will fall and probably scratch the door paint, until the the wiring stops its fall....
5. You will find that the serpentine path of the wiring will prevent it pulling through, so best to feed the wiring out manually before you try to remove the mirror.
6. Replacing is the reverse of this process, but also, in my case, the replacement mirror from the Wingmirrorman, had only a single wiring loom, as distinct from the 2 looms on the original, and whilst all important functions remain intact, ( electric mirrors, trafficators) and work, maybe there is a mirror-heating function that won't...But who gives a whatname....
So, I hope that helps - it would have saved me a lot of time...and damage...
