PRODUCT CAMPAIGN 95-C-12 - CERTAIN 1995 LUMINA AND MONTE CARLO MODEL VEHICLES HAVE A RIGHT HAND LOWER CONTROL ARM TAPERED BALL JOINT MOUNTING HOLE THAT WAS INCORRECTLY MACHINED. MOVEMENT WITHIN THIS ATTATCHMENT COULD ALLOW THE BALL JOINT STUD TO FATIGUE AND FRACTURE. TO CORRECT THIS CONDITION, DEALERS ARE TO REPLACE THE RIGHT HAND LOWER CONTROL ARM AND BALL JOINT STUD ON ALL INVOLVED VEHICLES. *TW