I've got a mk5 astra z16xer. Gana replace the condenser over the weekend but having issues finding the right o rings. I see vaxhaull do metal ones with rubber insides. Guy at work reckons I can just use green ones.
I did mine recently along with new compressor.
Condenser was Nissens and came with 'o' rings. They were the green ones only.
The compressor uses the 'bonded washer' type of 'o' ring. That's the metal washer with the rubber inside.
Nissens condenser by the way is really nicely made with full corrosion protection applied unlike OEM (hence they quickly rot)