SINGLE SPEED REAR AXLE 6 7 5 539 LOCK DIFFERENTIAL BEARING ADJUSTER 2 0890A I 86 88 1 I 235649 16121 RH 90186 86 87 1 15584528 17421 LH RETA NER 111120 5 539 PIN DIFFERENTIAL BEARING ADJUSTER LOCK 2 0915A 87 88 2 2 15585027 1504015 21065S 126156 5 543 WASHER THRUST DIFFERENTIAL SIDE GEAR I 2 1070A NOTE MAY ALSO BE USED W G86 IG86 NO SPIN 86 87 2 15583925 17421 11103O 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS M SB N S reference only Added this issue 5 9 5 539 5543 MAY BE AS REQUIRED PART REV 9 87