Moog RK620380 Control Arm/Ball Joint Assembly 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 Available as a separate component, no need to replace the steering knuckle, saving time and money Problem Solver patented cover plate design allows for tighter tolerances vs. traditional cover plate designs, providing a more durable and extended life part Exclusive cover plate protects against contaminants leaking into the bearing surface Moog Problem Solver design includes an oversized housing for a more secure fit