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Place the ball-joint frame through the upper control arm until the mounting holes are flush. It will be snug because the ball-joint seal rests against the arm. Line up the mounting holes and reinstall the three bolts and nuts. If you had a riveted installation, you might find it necessary to enlarge the holes in the control arms in order to accommodate the new bolts as supplied with the ball joints. Then screw the grease fitting into the top center hole as shown, using care not to over-tighten.