Hi everyone..

I'm baffled.. I purchased a set of Cruz Roof Bars, but I'm unsure how they safely fit onto the vehicle. 

There are little silver plastic plugs on the underside of the roof, which I've removed. But it leaves a small hole.

I assume the roof bars are supposed to go into these holes, but how? Using what? Is there a screw? Should it have come with the bars or the vehicle?

Thanks.

There should be 2 elements. 

The bars and the clamps with a key to lock them in place on your roof bars. 

Do you have roof bars for the Saloon or Avant?

On my avant the roof bar feet clamp onto the roof rails.

On the saloon the applicable feet will clamp under the roof ionto the door frame.