Ryan, I replace the pucks in every ZA I touch. (about 10 so far) People just think they can run stock pucks and not worry about them, so I posted pictures for them.
Kurt, pucks dampen the impact when shifting from first to second, keeping the teeth on the gears from shearing off. Stock ones go bad after 20+ years, You should be able to replace them with nice aftermarket pucks and never worry about them again!