Hey all i got some BF XR6 rims and i wont to slap them on my EF XR6 but im not sure how big of a spacer to use i have been told 6mm spacers but it looks like they need more than that because the top of the wheel fauls on the top ball joint causing the wheel to stick and it pops the centre cap out (this is without the spacers) does any one know what actual size i need cheers

22mm. but to fit spacers THAT thick, you would need to have them made up, and then you would need to have longer wheel studs. better off buying adapters, unless you know the right people.
I think that you would be looking at $250 for adapters.

I had spacers made for me by my friend, out of scrap alloy that he had laying around.
fitting the longer studs is quite a task, as the studs are pressed in.

you need 30 mm adaptors mate