Here is a picture of it. I measured the whole length at roughly 35" and the tail section housing at roughly 18.5" not counting the rubber seal on the end.

The numbers stamped on the case below the shifter brackets and above the pan are 732534 4374 2122.
That first number doesn't make sense though. It seems one number short, from what I've found on the web, and it should have a PK in front of it, but doesn't. The second number is the date code which I believe is July 18th 1973 (on the 10,000 day calendar). And the last is just a sequence #.