The one in the pictures that Gus linked us to is pre-'51 Spot. That would be what was
originally on your '50, 3104. In '51 and later models they went to the cross over style that
has the U-shaped hanger that you discribed. This type of carrier was used for many years
after its introduction.
Here is the layout for your '51, 3104:
http://www.pbase.com/dennygraham/image/138901806/large DG
