I don't know if it's the same or not but when I did the Golf I just had to remove the door panel and then take out a few bolts for the mirror assy. I can scan the page out of the Bentley manual if you think it will help.
The attached picture is how mine ended up looking. Made a template from paperboard then transferred to a cheap rubber mud flap I bought at the auto parts store. Sealed it up with black silicone rtv.
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