The bulletin dealing with the ground wire is dated Jan. 2, 1968, so it's anyone's guess when it came into effect. As for the binder, I picked it up on Ebay 4 or 5 years ago. It's loaded with interesting reading (bulletins, monthly news letters, instructional booklets, spec. sheets, etc.). One I find real interesting has to do with the early 427 Corvettes. It looks like they were having problems with overheating (new body design I suppose), one of the steps to correct the problem was to cut out openings in the lower valance panel and touch up raw edges with body color. They even supplied the template as part of the technical bulletin. Can you imagine dropping off your Vette at the dealer and then picking it up at the end of the day with touched up openings in the lower valance. That must have been entertaining, RonM.