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Not sure about the mustang. I dont think ford offers heated seats for any cloth options. Not 100% sure about that though. The VW gti does have heated front cloth seats.
If you have a premium with the comfort package (which I think that makes it premium) you will have them.
Heated seats are part of the Comfort Package.
Comfort Package is a standalone option on the Premium. You can have a Premium without Comfort Package. Comfort Package is not offered on base models (cloth).