I know the Recarro's are notoriously difficult to work on. IIRC the shop manual indicates that even removing the head rest is a shop task. I'm not saying it can't be done - just difficult.

Try googling Recarro (SP?) & get a contact number for the company. Maybe they can shed light on the subject.

There is a very old thread on installing seat heaters that may be helpful. I'll see if I can find it.