Classic/Antique Car Repair: 1950 Plymouth, tooth comb, pipe plug

Question
I am trying to replenish the fluid in the "pumpkin" of my 1950 Plymouth Deluxe. However, when I went searching for the fill plug I can't find one. I only see a drain plug on the bottom of the gear box. Everyone keeps telling me to look harder, it's there, but I have gone over it with a fine tooth comb and I only see one plug on the bottom of the box. Did some 1950's not have a fill plug? If mine doesn't have a fill plug what do I do?

Answer
Ok, we are pushing the limits of the old gray matter here so if I blow it don't call me a moron. The plug on the Plymouth if I remember correctly is a pipe plug that has a recessed 3/8ths square hole that you would use a 3/8ths drive ratchet to remove. The plug should be, again this is from memory as I do not have a 50 Plymouth here to check and believe it or not I cannot find a picture in any of my reference material, tucked in between the casting webs on the housing on the front side near the rear U joint.
Brad