Hi all, putting aside the outer cage plate and just concentrating on the pulley cage plates, I know my '79 has NR type bolts, and not the countersunk screws with nuts holding the pullies in the cages. I am sure mine is standard but then again I cannot be 100% sure as I bought it second hand from the states. I donot have any NOS to say wether mine is right or wrong or wether both versions were made in '79, mine also has the 3.5mm alloy rivat pins holding the bodies together. Anyone out there got a NOS version to give some informed details?......regards wayne davidson Invers NZ...warm sunny bicycling wether......