That was Squeeze who gave the part # for 1/2 ton axle seals, but since you asked, I had this '33-'61 Chevrolet Master Parts catalog hogging space on the kitchen table so:
'46-'61 3/4, 1 TON GASKET, rear hub 1/2 axle bolts (2& 3/4 I.D. x 4& 7/16 O.D.
Chevrolet part # 3680995
This should work in most parts stores as a cross reference for your axle.
