WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Front Lower Base - Sit-N-Lift
Courtesy of GENERAL MOTORS CORP.
Align the front seat base trim cover with the base and fasten the cover in place.
Fig 2: View Of Trim Covers - Sit-N-Lift
Courtesy of GENERAL MOTORS CORP.
Return the seat to the vehicle and inspect for proper operation.