The hubcentric rings didn't work because they were plastic and they just got smooshed because the wheels were a correct fit (I'm 99.9% sure they're original however if someone can remind me how to check that would be great).

I got it up on jack stands and got a mate to wobble the wheel horizontally and the control arm ball joint (not the wishbone) was moving up and down (in and out of the joint) by about 3mm. I'll replace those bits and let you know how that goes......

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2004 E53 4.4L N62