2 X FRONT UPPER BALL JOINT TO SUIT NISSAN Z16S Z18S Z20 Z20S LD20T TD23T SD23 1.6L 1.8L 2.0L 2.3L I4Ball joints comprise of a bearing stud and socket which enables pivoting movement in multiple directions to provide precise steering and handling. Worn out ball joints cause vibration, clinking noise, uneven tire wear and ultimately lead to loss of steering control. Ball joints are manufactured using high quality material which maintains perfect alignment and provides superior performance. This pair of front upper ball joints suit Nissan vehicles