Really struggling to get hold of a pair of upper and lower wishbones, anyone have any ideas, I've tried gdk?

Try Dermot Healey?

There's a good chance dermot will have some. But very little chance he will know which of his units they are in! Lol
It's like a war zone in his lockups

G20 stuff bolts straight on and geometry is the same and more adjustable. (Providing you don't have an early g27)