The picture of the front propeller shaft that Dan posted shows two setups, a 1st series 39 and a 2nd series 40-46. 102AC, CC and EC 1940 AC. Front. Type C-8 21/32" Long. 17 Long Splines. Incl Collar. 2102076 102 1939 AC. Front. Type D-8 21/32" Long. 10 Splines. Incl Collar. 2076882