Try to get these from RE - within a half year if you are lucky.
VITON O-Ring Satz für Benzinpumpe RE Himalayan
Dichtring Satz aus benzinbeständigem VITON ( FKM ) zur Abdichtung der Benzinpumpe innen. Nach Zerlegen der Pumpe immer neue O-Ringe verwenden ! Set of 2 fuel resistant VITON ( FKM ) sealing rings needed for internal sealing of the petrol pump. Always use new sealing reings when re- assembling...
www.royalbikeparts.com