Rear seal for A230

In 1970 IIRC, there were THREE different models of 3-speed transmissions in production; the A903, the A745, and the A230 aka NP230. It was the first year of the 230 and IIRC only available with the 340, OR, at least, it was the only 3-speed available with the 340.
And @Tanker details the seals nicely above