Hey Schuon,
It did not fit - but it wasn't specifically for my truck year and model. I took a guess based on my dimensions. I did end up finding the parts on Ebay that 54 3600 posted above. A nice NOS bearing and rubber cushion.
I made a quick video that goes over how I took it apart and reassembled.
Drive shaft center bearing overview:


1949 GMC FC253 - 1 Ton Dually
1966 Buick Wildcat Convertible