C991129H = 1971 warrenty main case 307 bearing size
C13212-3 = 1971 + 30 spline 307 bearing size output shaft (may be aluminum)
C95664 = side cover.....1964- 1971 ball and detent style.
not sure others mean.
my guess is that this is a 71 unit
F4X5 bothers me bcoz that has to mean something ....i will try to find out but off the top of my head this is all i have .....right now LOL
