Pictured seat is black with grey cloth, that's what I mean. This style of seat with this pattern was only available in black with grey cloth. You can get full blue leather or plush seats, but not the pattern you have pictured.
I actually have the exact same seats, and spend ages looking for a replacement so I can assure you I'm not loosing my mind
Differentiating between vinyl and leather in the advert is also important, as 850s did actually come with both leather and vinyl seats.