Please help! A6 C5 seat heating
 

Hi, I need urgent help. I own A6 1998 2.5tdi. It has over milion kilometers and my leather seats are very bad so I ordered new but used ones. The problem is I have stock climatronic unit without heating seat option. My stock seats are fully electrical but not heated. The guy who is sending me seats is also sending me his climatronic unit with seat heating options, and his seats are heated. How can I connect those parts together. I dont have green connector under my seats for connecting heating wire. My car is without seats at the moment, new one will come in one or two days so I decided to mount them and if possible connect new heating seats with heating. Anyone knows how to do it? I understand electronics.Thanks