I´m after an ´86 1100 Sportster crankshaft part # is 23900-86. Which is the number from genuine HD parts cat,(early ´86 model) The later/mid year ´86 model part # is 23900-86A. Does anyone know what the difference is between the 86 and 86A crankshaft would be? I´m doing a major rebuild on the motor,so would either early or later crankshaft do the job? Thank you.