A handful received that option... so not too many. I have seen 3 thus far besides mine.I had an 84 with the astro roof in it and some other options. Loved the car but it idnt love me. I got in a tight spot and had to sell her. I still see it driving around every now and then. I always wanted to know how many with the astroroof were around.
In 1984 all GN's and some T Types had the Lier seats. I believe the Lier seats were optional in the T's through '85 and possibly '86. Only leather was available in '84 and the T's didn't have the colored turbo 6 logo like the GN, only an outline of the 6. Someone correct me if I'm wrong.
I have a video on the '84's, I think from the speed chanel about how the '84 GN, with some tweaking, were as fast or faster than a lot of 60's muscle cars, but with better gas milage.