Very true, the bolts are not soley there to keep the wheel on the hub.. Even if they fit on perfect I'd never put any rims on without the spigot rings first. It's surprising what little plastic or aluminium rings can do ;) Take em down to your local alloy centre and I'm sure they will be able to find rings that fit the car and the tyre. I think there is a set on Ebay at the moment, Joz posted it in the E-bay finds forum.