Coolant loss from upper radiator hose housing?

[GlennH]

Noticed some coolant loss and it appears to be from the gasket that connects the upper radiator hose housing to the engine head. I've taken a stock photo and highlighted the gasket in red in the attached photo. To my knowledge this housing has never been removed.
Anyone else had this gasket fail?
Where did you buy the gasket? What is the gasket called?
Thanks for your help

 

[nd4sped]

Coolant housing gasket. if you cant find the actual gasket, you can make it by tracing the shape out onto a sheet of gasket material then cutting out with a razor blade.

You can buy gasket sheeting at any local auto parts store.