Now you can repair those sticky or old Rotary front alignment passenger car turn-plates or rear slip-plates. These are a 3/4" round celcon balls that will fit into either the front or rear rings on your Rotary alignment rack. Your choice of a single ball, a pack of 42 for the front plates or packs of either 216 or 288 for the rear slip-plates. An easy repair that makes old plates like new. Get your alignment rack running right again with new durable alignment rack parts from QSP.