Turns out it was my reservoir tank leaking around the side. Easily available online for not much money.
But to add to it. A coolant hose from a vl 5litre Commodore and a VR 3.8litre Commodore both appear to be able to be made to fit easily.
But the part number for the correct hose is 1K0122109M. Hose from reservoir to the engine. Hope this helps someone who needs that code in the future. Good luck finding one inside of Australia though without going to a dealer.
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