There are 2 shown in some places when I look for a replacement online. Just wondered if they both need to be done or is it just the green rubber one? See picture attached - if it come out lol!! View attachment 192668
The green elastoplymer gasket is for the inlet, and one that is likely to be the cause of the coolant loss.
The high temperature composite gasket is for the exhaust, which isn't responsible for coolant loss.