First of all, credit for this goes to @Dugey who sussed it all out and had the balls to dive in, even though I said it wouldn't work 
You need to change 3 parts, both mirrors and the electric window switch bank. Don't worry if the mirrors aren't the right colour, the caps are the same size and can be swapped for your original covers.
Step 1, remove the door card. There's 3 torx head bolts and 2 x 7mm bolts, the rest is clips.
There's a You Tube here that may help.
Door Card Removal
Inside the door close handle
Inside the door release handle
Behind the reflector on the side of the door
On the under side of the door card
Once the door card is off, you need to remove the plastic trim covering 2 of the mirror retaining bolts. The 3rd one is outside the door seal towards the front of the door.
Passenger side, better shot of the 3rd bolt.
I had all the wiring in this plug as you can see.
Step 2 is programming in the BCM, you need to be in Engineering mode to make the changes. You need to change 2 lines, the Rear View Mirrors and the Puddle Lights.
Took the opportunity to change the Puddle light to LED at the same time.
Night time shot
You need to change 3 parts, both mirrors and the electric window switch bank. Don't worry if the mirrors aren't the right colour, the caps are the same size and can be swapped for your original covers.
Step 1, remove the door card. There's 3 torx head bolts and 2 x 7mm bolts, the rest is clips.
There's a You Tube here that may help.
Door Card Removal
Inside the door close handle
Inside the door release handle
Behind the reflector on the side of the door
On the under side of the door card
Once the door card is off, you need to remove the plastic trim covering 2 of the mirror retaining bolts. The 3rd one is outside the door seal towards the front of the door.
Passenger side, better shot of the 3rd bolt.
I had all the wiring in this plug as you can see.
Step 2 is programming in the BCM, you need to be in Engineering mode to make the changes. You need to change 2 lines, the Rear View Mirrors and the Puddle Lights.
Took the opportunity to change the Puddle light to LED at the same time.
Night time shot