I’m rebuilding my ‘78 4-speed. The kit came with three seals. One is obviously for the input shaft. Another one fits in the cover that goes between the transmission case and the transfer case around the output shaft (see pic). Is there supposed to be a seal there? I ask because there wasn’t one there when I tore it apart. Nor is there any reference to this seal in the FSM. Lastly, there’s a third seal with no apparent home. It’s slightly smaller than the output shaft seal in question. Any ideas?