That should be pretty easy for you to figure out.
Measure the diameter of the mounting bolts that fasten the ball joint to the spindle.
If they are 1/2 inch diameter they are Drum brake ball joints, so order up accordingly.
If they are 9/16 diameter they are Disc brake ball joints, then also order accordingly.
If converted to large bolt pattern brakes, spindles, then those bolts used are 5/8 inch diameter, then you purchase 73-76 a body lower ball joints.
Easy peasy, go measure.
