Little more facts on the cloth seats....
All the cloth seats started with the '85s. (Third brake light all started with GM productions cars with 86 models.) I have one of the very first 85s made. I ordered my 85GN in August of 84. All the paper work we put in on the order listed the lier sigler leather seats also for my 1985. When my 85 GN showed up at the dealership the first week of November of 84. The first thing I said to the dealership was....where in the hell is my leather seats???? Everyone was scratching there heads with no clue what we were looking at as this was the first 1985 GN anyone had seen....surely not what the picture and brochure stated.
They had to call GM and found out the Lier Sigler could not handle the production for the 1985 cars. So GM went ahead with the cloth seats...not telling anyone of the upcoming change. Another interesting note since I ordered the car in good faith that GM was giving me leather seats as advertized and in my ordered contract, I really was pissed that I PAID for leather and got cloth with no compensation back for lesser product. Pretty much got a tough nuts letter back from the GM rep...with I still saved that letter.
So don't know the date that GN in photo was made, but if it is a 84 it has to be the last 84 model in the production line with my 85 being made right behind it with cloth seats in place. lol. By the way my car was built the first week of October of '84......oh and yes I still have my '85