Early Williams, Stern, and Chicago Coin standard 1-3/4″ coil sleeve.
This was used during the EM days, up to the end of production; in all standard 1-1/2″ coils except DT resets, and anywhere a “flanged” sleeve is required.
For Williams this was used in the smaller 1-1/2″ flipper coils, up to, I believe 1979 Laser Ball.
Williams changed over to the larger 2-1/8″ flipper coil in 1979 which requires the 2-3/16″ sleeve.
It was used in Early Stern up to the end of Orbitor.
In any case, if in doubt you can always purchase the 2-3/16″ coil sleeve and trim it back to fit your particular application.