Can someone confirm for me..?

Is this the small plastic part that goes at the base of the the rear legs on a type 1 1976 fronts seats, inside the runners.
Part number on it is 171.881.213

I can't remember if this is where it came from, the seats are rocking around, and I was told there should be a small plastic bit to go in there to stop them rocking around.

Should there be two for each seat? I can only find one piece, so I've lost 3 of them??

If this is right, has anyone got some of these they could part with?

ClassicVW at Rydalmere Sydney (forum sponsor) sells them................if you dont have any luck i have some👍

Kafer , I have a bucket load of these new parts as well as the front slider . You will need 2 for the rear on each seat which should be lubricated with a thin smeer of grease . If you do not use these sliders your seats will rock and feel loose . Also make sure that the rear channels on the floor are clean from and rust or debris , ROD , 02-42729920 .