Well we finally brought the car in and started taking it apart! We found the actual paper that is usually posted on the window with all the options on it when the car was made at the Fremont, CA plant. It does say the Trim is 988 and then with a black marker it was marked YES YELLOW on it. So we are pretty sure that the yellow seats are correct. I'd like to email you a copy of the paper I'm talking about. Maybe this will help a little more.