New Cortina 2000e type 3 rail gearbox synchro ring set
Will suit later type hubs only built late 1969 on but many early gearboxes have already been converted to the better later baulk rings.
The way to tell is.... look at the wall of the ring where the blocker bars fit and see if the brass has been machined as a "slot" like the type in the photos or all the way through like our early rings listed.