Heated Seat Question

[Bill D]

I have a 99 SL500 that shipped without Heated Seats and I would like to install them.
I would imagine all cars manufactured have one wiring harness regardless of the factory installed heated units.

Does anyone know if the wiring harness running through the console has the appropriate wiring for them? If so, I could just have the heating pads installed and purchase a new console with the switches.

Or perhaps you know where some used seats could be purchased with the units already installed from the factory.

Thanks for any help.