I just did all the seals on my 82. I will give you a rundown of what I used.
For the t tops I used the Soffseal kit. I got it from Summit for about 225 bucks. I think it fit good. It is definitely a bit thicker then original. I would stay away from OER (the Hawks kit) because I haven't heard too many good things about it. The other alternatives would be Metro or GM. Metro fits kind of like the Soffseal kit - a bit thicker then original. The GM seals are the most expensive. I never had luck with the originals so I tried something different. I think it worked out for me. Be prepared to do plenty of window adjustments with an aftermarket kit as the extra thickness throws everything off. Here is a pic of the Soffseal installed.
For the door seals I used a little known brand - Fairchild. They are sold by Rock Auto and JC Whitney. I took a shot because all of the other brands are missing the plastic inserts that are molded into the ends where the weatherstrip screws to the body of the car. I have to say, I was very happy with them. They have the molded inserts and fit great. The plastic retainers that go around the door all fit properly and are spaced correctly.
For the outer window sweeps I bought original GM. Thirdgen Ranch sells them for a reasonable price and I did not want to take a chance on the aftermarket ones since I wasn't sure if they had the thick added pieces of felt on them like the originals. I wasn't all that impressed with them as some of the holes did not line up and I had to make some new holes.
For the cowl gasket I used Soffseal and, even though it looked original, I was a bit disappointed with it because it did not have the retaining pins installed. I had to add those by lining it up with my old one. Metro sells one with the pins already installed.
For the drip edges on the t tops I bought the rubber ones from 1A Auto. I liked them and they look good. The only trouble is, they are molded a bit too thick on the inside corner and it forces the outer edge away from the t top. It came with double sided tape to install it, but the tape keeps pulling away from the top because of this.
I called 1A about it and they credited me back what I paid so I can buy the plastic ones. I have the plastic ones but I haven't installed them. To tell you the truth - I think the rubber ones look nicer. The plastic ones look a bit cheesy.
This is the rubber drip edge installed on the t top.
This is how they look on the car. You can see the middle is sagging a bit. This is also due to the fact that the gaskets are very thick on the ends and push up on the drip edge. The Soffseal gutters molded into them are very thick. After I took this pic I adjusted the window height so that the t top weatherstrip isn't getting compressed as much.
For the hatch I used the Metro hatch seal. It was OK, but is not molded exactly like the original. I think Metro uses a general weatherstrip cut to size that also fits trunks. The problem is, the original hatch weatherstrip is a little thicker on the outside edge to ensure contact with the hatch glass. On the sides of the glass, the contact is not made with the top of the gasket, it is made with the side of it. So there is a spot on my car where the gasket is not being compressed when the window is closed. I never had this problem with the original.
The window triangles are made by Soffseal. I think they fit good.