[slrech]

How is the driver's side mat held in place. It is too tall for the pins and keeps sliding around.
These are the factory option mats from Chevrolet.

 

[Denali AWD]

How is the driver's side mat held in place. It is too tall for the pins and keeps sliding around.
These are the factory option mats from Chevrolet.

A picture would help but if the hold down pins won't work with the mats then I'd say you have the wrong mats. Make the dealer give you a set that works.