With that must discrepancy I would measure the drum and spindle with a set of calipers. Once you determine the size you can order them from several auto supply houses at about a 1/3 the cost of a trailer shop.
Try and get a double lipped seal.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles