63 slant 6 904 transmission seal and o ring question

Just a FYI: The output shaft seal is different between 64 and 65 cable shifted 904's. I will assume 60-63 is the same as 64, but don;t know for sure.
Pat Blais (Tflite patty) can usually help you out with early 904 and 727 parts. Best to send an email [email protected]
Hard to get him on the phone: 206-365-1966