not pre wired nut easy to do.

I have done it. it is easier to buy doors that have the correct brackets for
the mounts. but you can easily fabricate them in your existing doors. the
wiring part is pretty easy. but dont forget they wire tup to the rear defrost too.
they are heated. I suggest that if you buy the mirrors ( I have a set if you
need some) that you ask for the wireing harness to go with them.

Hope this helps

Chris
VT
91 westy (all the options)
87 westy syncro