Centre Bore Size Required?

ET38 will prob stick out to much. I have 8j rims with an et45 and they are about as far as you can go really.
 
Actually so confused now, I have tried using the fitment calculator on the other thread but don't know if they are 215 45 17, says they should fit on there though.

Still a bit dubious!
 
215/45/17 is just the tyre size. Those tyres will fit on a 7J, 7.5J and an 8J rim... You can also fit 225/45/17 tyres on.
 
Ah sweet cheers mate, I'm still not sure on the ET38 then. Maybe give them a ring and see if they do a 45 and also what size the bore is.
 
I normal a line on a piece of paper to conpare how far they will stick out.