WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Install the bound stopper to the piston rod as shown.
Fig 1: Installing Bound Stopper To Piston Rod.
Courtesy of MAZDA MOTORS CORP.
Verify that the lower end of the bound stopper does not contact the cylinder.