IMPORTANTIf you have hubcentric rings fitted in the wheel or on the vehicles centre hub spigot they must be removed.
Test fit the centre cap onto the vehicles centre hub spigot first, ensure it locates neatly on the centre hub spigot and sits flush against the hub face withno gap.
Then remove the centre cap from the vehicle hub and add a small amount of vaseline or grease to the O-ring before installing into the wheel.
Now fit the centre cap to the inside of the wheel, they are a snug fit, ensure they are lubed first,pushing on the edges of the centre cappush them right in and ensure they are seatedflush with the wheel faceand not protruding.
Now the centre caps are fitted you can put the wheels back on, note how the centre cap locates the wheel hubcentrically onto the hub. This will centre the wheel more accurately, improving fitment and reducing possible vibration.
**IMPORTANT**Ensure the wheel is fully seated against the hub face and there is no interference or issues before tightening the wheel.