Have a google search on "Hogshead Firebird and Trans Am"...this site has a section dealing with T-tops roof panels and seals.
i'm assuming your T-tops are hurst Hatches, but the ycould also be American Tops or C&C Tops (Cars &Concepts).
The later two are difficult to get the correct seals for, the Hurst hatch seals are being repro'd these days...both the early 1st series, and the later 2nd series are supposed to be available.
Be aware that even new, these Hurst hatches leaked..hence the redesign from 1st to 2nd series, which helped a bit. You'll need to look at the above website to correctly ID your tops and get the right seals.