Got loads of pictures!!
You need to make sure that the replacement mirror has all the functions of the original.
They are all fitted with heated glass.
Are yours folding?
Memory mirrors that move with memory seat?
Auto dim glass?
The motors are different between "plain" and "memory".
Folding mirrors have more wires, so do auto-dim.
Do you have the original bits? The motors are swappable, if you have the original and the new one is different. The mirrors with more functions have two connectors in the door fixing.
But it's an easy swap if it's like for like. Four bolts in the door. One or two plugs.
Photos are on Photobucket. Photobucket is down for maintenance at the moment. They should reappear soon.....