My 2010 passat B6 wagon has had a very small coolant leak for a while, but has suddenly got a lot worse. I jacked up the car and got underneath and it appears it is leaking from a plastic flange where the coolant pipes enter the bottom of the engine.

Much searching online has failed to even give me a list of the coolant system parts, let alone even a simple exploded view to name the part.

I assume the gasket has gone, but if I'm going to replace that, I think I would replace the whole flange as I have heard they can split/crack, better safe than sorry.
Any help appreciated.