All over the internet it is mentioned to turn the mirror about 45 degree to remove it. This is not correct, one can break the tabs, causing wobble of the mirror or it can fall off.
This is how to do it
http://i.imgur.com/VeOa20u.jpg
That is from an E36 EBA, but same procedure for E32 and E34.
See here the one from E34 workshop manual
https://www.bmwtechinfo.com/repair/m...es/7411027.jpg
Removal: Pull mirror back off the mirror socket
Installation: Connect mirror base on the mirror socket with an approx. 45 degree turn.
Turn mirror base until it engages on the mirror base.
Important for everyone to see this one
So I am posting it in-line. Shogun probably didn't bother as so many things one tries to post (at least PDFs) cannot be posted on this forum due to filesize or image res.
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08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!