Product Details: Differential inner axle shaft seal (1) seal per box (2) seals required per axle. Replaces obsolete Spicer 48773 and 52148 Oil bath style 1.562" ID (shaft size) 2.627" OD (fits 2.625" ID bores) When installing this seal, the side with the rubber face (where 2019816 is molded) should face the differential. We recommend greasing the shaft near the splines/seal diameter when installing the axle shafts. New plastic "ramps" should be installed at the same time 1999 - 2004 Super Duty F-250, F-350, and Excursion use Spicer 48058 1999 - 2004 Super Duty F-450 and F-550 use Spicer 48059 2005 - Current Super Duty F-250, F-350, F-450, and F-550 use Spicer 53987 Parts Included: (1) seal Fits: 1999 - 2004 Ford Super Duty F-250, F-350, F-450, F-550 with the Dana 60 front axle 2005 - 2018 Ford Super Duty F-250, F-350, F-450, F-550 with the Dana Super 60 front axle 1999 - 2004 Ford Super Duty F-250 and Excursion with the Dana 50 front axle Ultimate Dana 60 front axles GMT800 with the rear steer (Quadrasteer) Dana 60 axle Older Spicer Ultimate Dana 60 front axles Brand: Dana Spicer Part Number: Dana Spicer 2019816 Warranty: 6 month warranty and case by case basis.