I was lucky enough to find a NOS Okie bearing for my '53 half-ton drive shaft on eBay for a song, but it's documentation indicated that it was for the 40-50 chevy trucks and passenger cars, and that the 51-54 truck and passenger cars used a different part number. Classic Parts even lists two bearings, one for 47-50 and the other for 51-54. I've heard mention that the only difference is in the inner diameter of the outer tube (outer diameter of the okie bearing). As far as I know, my torque tube and rear-end are original to this 1953 model, but the Okie bearing looks like it might fit anyway. Does anybody know how different the two diameters really are? (I don't want to get it jammed in there!) Thanks, -Warren