Quite far from me but can guide you.
Once you have the seats, you have to look under them to find a small control module box. Depending if you have the module under 1 or both seats then you buy the correct loom. The loom plugs under both seats, 2 ground points, i think 2 to the fuse box, one to the CECM and then 3 wires behind the heater controls. Oh and you will need a new heater panel with heated control switch.
Once fitted and wired, just activate it with VCDS ;)
