Removing the old bearings, races, and seal from one hub will be the most accurate way. Second, you could get the 9 digit serial (lot) number from the axle tube, call Dexter Axles, and they will give you the Dexter numbers for the parts, which can be cross referenced at the parts store, to the brand you're wanting to buy.
The Dexter numbers for individual pieces (not kits) will be close, or the same as major brands. Try for Timkin bearings, and double lip grease seals.
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