the colours and functions of the wires at the mirror connector are as follows.
Pin 1 12 volts when mirror adjusting up, blue/yellow wire, earth when adjusting down.
Pin 2 earth when mirror adjusting left, 12 volts when adjusting right, yellow/violet wire.
Pin 3 12 volts when adjusting mirror left, earth when adjusting mirror right and 12 volt
when adjusting mirror down and earth when adjusting mirror up, white/green wire.
Pin 4 12 volts with heated mirror on, green/orange wire.
Pin 5 permanent earth, black wire.
Pin 6 should be an empty pin.
Being a Ghia spec car if the indicators are in the mirror and there are puddle lamps then there will be more terminals to the mirror to account for these.
If the wiring doesn't match the connector let me have the chassis number and I'll be able to check vehicle specific wiring.