Yes, o-ring goes on first, then the teflon ring. Be careful as there's two o-rings of similar sizes. One of them is in the aforementioned location, the other is for the working piston cover to housing.

__________________
Onus probandi incumbit ei qui dicit, non ei qui negat

I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


1984 300D "Elsa" odo reset 6/2011 147k
1983 300TD "Mitzi" ~268k OM603 powered
1995 E300 "Adelheid" 262k [Sold]