I have used KYB struts and shocks as replacements for my personal vehicles for many years and have always been impressed with their handling and durability. KYB SM5570 ships with (1) upper spring seat and (1) spring isolator. The spring seat is made of steel and the isolator is made of rubber. Highly recommended. Tip: With proper "timing" the tab protruding from the upper coil spring seat (see image) should be pointing into the wheel well or 180ยบ away from the strut mount (where it attaches to the steering knuckle with (2) bolts). .