"LEFT HANDED SYNCHRO-SELF-SHIFTING SIZE 160T; 69 STRAIGHT EXTERNAL SHAFT SPLINES ON A 6.900 PCD WITH A 10/20 DP AND A 30 DEGREE PA; 18 MOUNTING HOLES EQUALLY SPACED ON A 17 IN. PCD; THREE STEP BORE 6.1035,7.O485,7.O895; OVERALL DIMENSIONS 18-3/8 IN. DIA X 18-3/8 IN. LONG"