904 question

i have a 72 904 340 car trans.. what other years of 904s will work with TC or are they all the same for the tc splins. i have a new TC and i dont want to get a new one cause splines are wrong
NON LOCKUP converters 1968 - up 27spline.
LOCKUP converters 26 spline.
Early 904"s 18 spline.