The switch for the heated mirrors is part number 321959565 and the loom info is here

and the info ON the mirrors themselves...
(3) 324857501A
rear view mirror (convex) (electrically operated and heated) / if necessary paint in color of vehicle / F 53-F-000 001>> / also use:
left outer rhd >>53-G-060000 161 971 970 161 971 975 /
(3) 324857501
rear view mirror (flat) (electrically operated and heated) / F 53-F-000 001>> 53-F-060 000 / also use:
left outer rhd 161 971 970 161 971 975 /
3 323857501A
rear view mirror (flat) (electrically operated and heated) / if necessary paint in color of vehicle / F 53-F-000 001>> / also use:
left outer lhd >>53-G-060000 161 971 970 161 971 975 /
(3) 323857502B
rear view mirror (convex) (electrically operated and heated) / if necessary paint in color of vehicle / F 53-F-000 001>> / also use:
right outer lhd >>53-G-060 00 161 971 970 161 971 975 /
(3) 323857502A
rear view mirror (flat) (electrically operated and heated) / F 53-F-000 001>> 53-F-060 000 / also use:
right outer lhd 161 971 970 161 971 975 /
(3) ---------
no longer available / F >> 53-E-060 000
right outer rhd /
(3) 324857502
rear view mirror (flat) (electrically operated and heated) / if necessary paint in color of vehicle / F 53-F-000 001>> / also use:
right outer rhd >>53-G-060000 161 971 970 161 971 975 /





