[Qmulus]

FWIW, I got a set of the seat heater kits from heaterseats.com years ago. They claim their OE kits are factory installed in new Porsches, Audis and other makes. I was very impressed with the quality of the heater pads and included wiring. I installed them in my wife's GMC Jimmy. Installation was pretty straightforward and you can cut these pads to fit, unlike some others. That was a Christmas present for her, and honestly I think it was the one present that she used every day in winter. If I didn't already have them in my Boxster, I wouldn't hesitate to use their kits. You might be able to use the Porsche factory switches with them, or just put the switches in the batwing.