Discovery 3 Steering Rack Components
From VIN 9A496360 (2009) the track rod ends on the Discovery 3 steering rack where uprated. Assemblies are most easily identified by the nut holding the track rod end to the swivel housing (knuckle). The later nuts are M14 thread while earlier nuts are M12. The track rods within the steering rack remained the same throughout and will accept either M12 or M14 track rod ends.
Complicating the issue is the fact that for many years now the only knuckles available have been the later type that will only accept M14 track rod ends, so earlier cars with replaced knuckles will have had to be converted to later track rod ends. It therefore follows that unless you know the full, unabridged history of your pre VIN 9A496360 car you should not assume it still takes the same size track rod ends with which it was originally built.
When replacing track rod ends, to be safe you should measure the thread size of the track rod end to knuckle nut before obtaining replacement items.