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Sorry, I've only just found this thread, but may be able to help you a bit.
Here is a link to an MY01 wiring diagram which includes all of the wiring on that model for heated and folding mirrors. Hopefully this will be similar to the wiring on you car.
HTH
Duncan
PS The file is 'kin massive, so download it at work.
I have managed to source a pair of folding mirrors and the central switch, which is a direct replacement for the current adjusting switch in the centre console.
If you just fit the replacement switch and the mirrors, only held on by three screws (although you do have to take off the door trim to connect the mirrors up). Lo and behold it works, just like it says on the tin!!
So I would suggest you all need to find a pair of mirrors and the all important new switch and go for it.
Ordered my pair from Midland impreza.com should be here in the morning. He had two sets left in sonic blue so if you want the last one give graham a call.
SO from what ive read so far can buy a set of these folding mirrors and the control switch and just plug them in to my 98 UK Turbo and they will work....?
BAH so far we know you can get them working with just changing the switch and mirrors on a P1. You'll need to check your wiring to see if the same is true for your MY98.