Engine Kohler oil breather/separator leaking

First time post. I am trying to maintain my late Dad's Lazer Z with the Kohler Command Pro 18 (CV18S) engine. It has been leaking oil and looks to be coming from around the oil breather/separator. I suspect that it just needs a new gasket, which I have found.

Just curious if there is anything else that I should pay attention to when I pull the breather off to replace the gasket?