Hi guys, Going to properly flush the cooling system on my VX so went to local Holden spare to buy a genuine thermostat for $11. When they ask me if I needed the gasket and O ring, I was a little unsure. I know you will need to replace the gasket when removing the housing but I didn't know it has a O ring? It turn out they don't have the gasket and O ring in stock so I had to go supercheap. Supercheap Auto's only had the gasket but when I asked the employee there about the O ring, they said the VX shouldn't have an O ring, just need a gasket. So I just bought a Tridon self adhesive gasket for $3. Anyone know if there is an O ring in the housing and does it need to be replaced if opened? Share some light please guys. Thanks.