I want your faulty electronics
You can pick up A3/4 folding mirrors from Ebay for about £25 each.
You then need the relay from a A3/4/8 from about the same year for about £30ish (I can't remember what I paid for mine) off ebay.
Some cables, relay holder and a new mirror switch from the dealer and the jobs a good-en.
It cost me less than £100 for my set up.
I also found out that some of after market mirrors, the sort you get from GSF, comes with the motor for folding mirrors.
Here is some videos.