The Current 1260R (aka 3668R) O Ring Kit consists of 2 black O Rings and 2 white ptfe Rings and Grub Screw.
Depending on the age of your own Spout, you might only have 1 white ptfe ring. Usually these white ptfe rings do not need to be replaced unless broken.
This is a Genuine Spare Part.
BREXIT: No additional charges on delivery once your Order before shipping charges is less than £135.