I agree with JonM. Stick with GM original parts. I replaced two of my weatherstrips from Eckler's products that were not GM originals. I was sorry for the final results, especially from the feel and touch of the non-GM strips. They filled in fine, assembly was okay, but the surface texture and exact geometry are not the same. Only an expert eye can tell the difference, but I am still at pain with this. I think Art's Corvette Parts carry some inventory of GM originals. Try them first for the price.
A few bucks of extra is well worth avoiding the heartburn...
GO FOR GM ORIGINALS IN ALMOST ANYTHING YOU DO TO YOUR CAR