Pull the damper, use a hook, if you have one, to pull the seal. Use a seal driver, if you have one, to drive the new one in. Put a little wipe of permatex form-a-gasket (my preference) around the outside of the seal first. Check the damper for a groove where the seal rides. If ok, the use the proper tool to push the damper back on. If there is a groove, get the seal kit that has a sleeve. DO NOT DRIVE the damper on. Use the correct tool!