This seal fits the FL Steer Spindle design (shape & size) at the end of the axle. ConMet PreSet Plus Wheel Hub Applications with the FL application would need this type of seal. Conjointly the Axle shape and size would also determine size of bearings needed which in this case is: PreSet Bearings; Inner Set No. SET445; Outer: SET446 or Inner ConMet No. 10041925; Outer ConMet No. 10041926. Conventional Bearings: Inner: SET423, Outer: SET424 or Inner ConMet No. 10041925; Outer ConMet No. 10041926