WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Install the wheelhouse splash shield to the wheelhouse.
Push the retainers into the wheelhouse holes in order to retain the splash shield to the wheelhouse.
Fig 1: Installing Wheelhouse Splash Shield To The Wheelhouse