Those seals are not available anywhere. I have been looking for many years.

Seals for the opening windows on later year trucks are still available. I almost looked at the feasibility of putting the newer, opening windows in my old cab, but instead I just decided on using a complete 92 cab now with older doors, fenders, and bed.

My original 73 cab had some rust and shoddy, old body work and I stumbled on a clean 92 clubcab for little money and just decided to switch all the stuff over instead of body working the original.