These ball joints are a direct replacement for 65-68 ball joints and can provide up to 1.5 degrees more negative camber.  They can also be used on 69-89 cars if the front A arms are modified to accept them, this includes cutting the end of the A arm off and securing the new ball joints with two bolts on each side.
Sold as a pair
Available with wedge pin style ball joint connection for 72-89 struts or tapered end with thread and castle nut for 65-68 struts