Thanks Joe,

I have looked up that part number and specifications and I'm pretty sure it fits 3/4 through 2 ton AD trucks, and likely more years that I'm not familiar with.
This is the rubber bushing, bearing, and shields to rebuild the original carrier bearing/hanger.

As seen in the shop manual here, and rebuild instructions:
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0456.htm
"propeller shaft bearing support"

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-