Mini ball and cup, fits the top arm and rear trailing arm
21A1163- SUSPENSION KNUCKLE JOINT
These joints are complete with the knuckle, nylon cup (21A423) and rubber boot (21A425). If your suspension has dropped suddenly, or you have loud squeaking noise during suspension movement, then these knuckles are one of the first things you should check. If left unchecked, the knuckle can wear through the nylon cup, into the suspension arm, and ruin the casting that supports the knuckle joint. Much cheaper than changing arms.