Hi
Electric leather seat weights 28,25 kg each. This is checked from ETK. So 56,5 kg both. I´m changing to my car Sparco racing seats and they weight with all stuff needed to install them into car 20 kg both, so weight saving of 36,5 kg. These are easy to change, only two bolts in the rear and of course the electric connection in original seats.
By the way, if someone wants to keep all the seats in good condition the rear seat can be removed too, and there is some good weight saving in it too...
But then it don´t look like a luxury Sedan anymore. It´s easy to remove when needed.
Best Regards, Janne.