After market knuckle joint (Ball Joint). Front up to 1990. Rear all. See GSV1118 for OEM. See GSV1188 for front 1990 on.
These joints are complete with the knuckle, nylon cup and rubber boot. 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.