Ted, if you go to lionelsupport.com and search on those item numbers you can see the parts used including all the fasteners. I know the J3s were inch including the 1st Dreyfuss. The ESE is metric. As for the J1s it was likely mid 2000s when they went metric.
The PWC GG1 I have has a metric Pullmor. Never paid attention to the fasteners.
Pete