That bearing is listed as GM part # 954257, New Departure # X-88107. 88107 is available in multiple places including Summit Racing. Grainger's has a sealed one. The seal is GM part # 3689176, "1948 and after, w/ 1.500 shaft, spring loaded". A quick search finds the seal at The Filling Station and eBay.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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