I just purchased a set 18X8.5 ET35 from Ebay. I found a piece of paper in the box that says (In order to have an appropriate usage of the wheel,It has to be equipped with the adequate centering ring and fitting parts RONAL/CENTRA.) I don't see any ring on the rim. Is it just straight bolt on ? I'm hoping there won't be any problem when i mount them on my 2002 C-Coupe.