Two kits are needed The tether strap kit sold by the car seat maker. Most tethers are easy to attach. The tether anchor kit sold by the vehicle dealer. Use the kits made specifically for your car seat and vehicle. Tether anchors are easy to install yourself in many vehicles.
Most vehicles have tether anchor kits available.
Some tether kits are free, and some dealers install them without charge. Most vans, SUVs, and pickup trucks will have them a year later. For details about locating or installing a tether anchor, always check the vehicle owner's manual first. Your local dealer's parts catalog and service manuals give installation information. Part numbers also can be found in the book, Tethering Child Restraints .