How to find the right part number for Rheodyne, Vespel Rotor Seal for 7125i HPLC Manual injector

Rheodyne 7125i look like below picture:

This Rotor seal is very popular, many OEM part has:
Part number: 7125-047,
Rheodyne, Vespel Rotor Seal for 7125

Part number: 25280 Restek,
7125 Vespel Rotor Seal

Some more picture for how about this valve look like:
https://www.gimitec.com/epn/?s=7125