Moog K5301 Ball Joint Problem Solver powdered metal gusher bearing design enables grease to flow through the bearing to the stud for reduced friction and enhanced strength and stability. Problem Solver patented cover plate design allows for tighter tolerances vs. traditional cover plate designs, providing a more durable and extended life part. Maintains maximum ball to bearing contact for greater load carrying capability. Moog engineered steel composition results in a stronger component Full ball metal stud provides 36 degrees of smooth, consistent, rotational movement resulting in more responsive steering. Shot peened stud shank adds strength and durability. Fits 1988 - 1996 GM Vehicles Designed as stock replacement All parts meet or exceed OEM (original equipment manufacturers) standards Easy to install