Hi,
i'm sorry but the 550 Spyder edition model seats are not standard leather. Both cocoa or dark grey seats are natural leather seats, which was an expensive option from standard leather for the normal car and the quality of the leather is different - less paint on the leather, more open pored and by that more breathable. This leather is also more sensitive against moisture. Which maybe describes the really bad condition of the drivers seat.
The rear cover of the seats is painted with the exterior color GT silver. You look for heated seats. As i said, these seats will be hard to get - especially in dark grey color.
Regards from Germany
Markus
Again cocoa: