hey guys, i realize i'm new here but i dont believe those t-tops are factory. look at where they start at the post there is a gap. it only sticks out to me because my brother bought an '86 Monte SS and was told that his 2 were factory and come to find out they werent and his had that same space as this one does it compare that space to other GNs with t-tops..... jus maybe. Nice car tho.