Saginaw 3 Speed drainplug help

[68haywagon]

I'm out today changing fluids and I finally get to the transmission and I can not find the drainplug . There is one plug about halfway up on the right side which I know is the fill. I have search google and this site tryin to find it without any help. A few pictures I found show the plug on the left side toward the front but mine just has a flat spot in the case. I have went over the thing very closely and can't seem to find anything. I de-sludged the case and still nothing . Did GM make them without plugs?

Any help will be appreciated.

Thanks,
Mike