They are not really lighter as they are built on factory bases, which is the heavy part of the factory seat. Obviously you could build racing style brackets and drop significant weight if that’s the main objective, but you could do that with the factory seats. In my case, I thought it was tricker to incorporate the motor functions of the factory setup, particularly moving the backrest motor outside the seat. And these tilt forward to access behind the seat, Unlike the stock ones, which was something I always found irritating about the factory design.

Yes, still available, please PM me if interested.