Brake servo linkage o rings????????????

On the diagram below - part 25 is listed as O ring - 17221741

I had none fitted when I dismantled the linkage??  I have the felt rings but thats all….  I see no one sells them on the net.

Anyone else got these fitted??

Hmm, i stripped one of these down last year.  Had the felt washers but i dont recall anything that looked like an O ring..

as its not linked to oil or covered to stop ingress i guess a normal copper washer or flat rubber tap washer will do the same job, i imagine its to stop water dripping into the pin and rusting it upmaking action stiff,grease inside of the linkage bush/pivot(17/25) .https://www.toolstation.com/rubber-washer-pack/p23104

similar to when do wiper arms, (205gti) i removed linkage to wiper arm and cleaned the pin that was fitted with oring at the top under washer and arm locking nut/circ clip.