You could swap to the 53 and later spindles and they do make bearings for those. (or keep your spindles and make bushings to adapt the outer bearings to them)
http://www.classictruck.com/product...g_BR2716-R/1955-59_Trucks_Wheel_Bearings
http://www.classictruck.com/product...g_BR2706-R/1955-59_Trucks_Wheel_Bearings





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-