Les, WELCOME! Since Clyde is away at the show I will try to fill in the blanks as best as possible. Clyde will clarify anything I may not have correct. Anyway, first and not to be rude, did you read his link to the original thread about the channel felts? It is all explained there.
I do not know from whom he gets the felts and as far as I know he found something that will work for our needs, but not made SPECIFICALLY for our cars. Clyde is pretty ingenious when trying to fill in the gaps of missing/hard to find parts for us. His cowl seal is the same way. No one makes it specifically for the cars(that I'm aware of). He buys a length of seal and some clips, takes his time to cut it to proper length, cut the little holes where the clips go and inserts the clips.
The window channel felts that I have purchased from him are for the HB. I assume the felts he has presently are for the HB as well. He can answer that for sure.
And if I remember correctly he is trying to find some seal material for the hatch seal, as well.
Any other questions Clyde will be happy to answer. Just wait till Monday when he returns to the forum.
Hope this helps.
Good luck and have fun.
cheers jer