You can upgrade the internal mirror to the auto dimming one (or auto dimming with compass), as the wiring looM is already there in P1 platform cars, and no ECU programming is needed. Here's a thread, there's a few others too if you search:
https://www.volvoforums.org.uk/showthread.php?t=280916
If you want to get one new, they're pretty pricey:
https://www.volvopartshop.com/mirror...50-13475-p.asp
Best bet might be to get a second hand one from a breaker's yard or eBay.
I wouldn't be so confident you can upgrade the external mirrors to auto-folding ones.