I have aquired a set of D2 electric folding wing mirrors.

i am of the understanding that the wiring is in (mine are heated but not leccy folding) and that on the electric folding version you push the switch down when it's in a neutral position and they will fold in/out.

My question is, is this standard amongst all of them and can just bolt the new ones on and have them work, or do i need a specific switch and/or wiring loom to enable this functionality.

Do you have RAVE?

You need a dedicated switch for folding mirrors(YUH100260) and a folding mirror ECU(YWC105260) , normally the plugs should be there and if they are everything is plug and play after that but if it's an early modell you might have the surprise to not find the ECU plug and the switch plug to not be wired for that, this one:

It's 2002so middle /late and a facelift.

I will have a dig and see what's there.

Cheers.