Removal Procedure

Remove the screws retaining the front half of the cladding to the front wheelhouse.
Remove the push-in retainers from the front wheelhouse.
Remove the nut from the stud on the front half of the cladding.
Remove the push-in retainers that retain the front half of the cladding to the retaining rail.
Remove the cladding from the retaining rail.

Fig 1: Removing Cladding From Retaining Rail (Right Rocker Panel)
Courtesy of GENERAL MOTORS CORP.
Remove the screws retaining the rear half of the cladding to the rear wheelhouse.
Remove the push-in retainers that retain the rear half of the cladding to the retaining rail.

Fig 2: Push-In Retainers (Right Rocker Panel)
Courtesy of GENERAL MOTORS CORP.
Remove the retaining rail screws.
Remove the retaining rail from the body.

Fig 3: Removing Retaining Rail From Body (Right Rocker Panel)
Courtesy of GENERAL MOTORS CORP.