Guillaume did an amazing job on these seats. I also have the same beige interior. Is there a “right” color or does it really mostly involve taking a hopefully unfaded sample from the bottom of the seats to use as the “correct” color? Personally I think the best approach is to use a color that approximates the color of the plastic around the seat area. My car spent a lot of time in the Florida sun and has sun damage in various areas, particularly the rear parcel shelf. I have been in e-mail with two North American companies that can provide color matching and other products to restore the seats in the same manner Guillaume has. Those companies are Leatheriqueusa@gmail.com (located in the USA) and Leathertouchupdye.com (located in Ontario, Canada).
Excellent job Guillaume and I’m very jealous.