Why the difference change in the cup sizes of Turnlock HGR?
Your old part has a larger cup size with the same length number 8. The change goes until length 15, the old series have a larger spring cup size.
The new Turnlock from length 1-15 has a smaller spring cup size. Already from 2012.
Parts are equal in fit and function. Due to the cup change, it is advised to start using a retaining washer from length number 5 instead of length number 16.