Gasket for dephaser cap - available?

[Rawhide]

Hi - I've finished my timing belt job and noticed what I think is a missing o-ring or gasket. I see what looks like a plastic ring on the old dephaser pulley but don't think I could or should try to save it.

Can this be replaced or is it new cap time..

 

[Rawhide]

I managed to remove the old washer thing from the old dephaser. I'm assuming that should be OK.

 

[Brigsy]

Reuse the old one, should be fine. Run it up and check it doesnt leak