The old ones I think are leather,new ones being rubber and a spring.Flat-side out should keep the grease in.I repacked mine when I got the tractor and changed the width of the wheels.Didn't do the seal,was not leaking.Probally should have though.My wheels wobble[why I repacked the bearings]but was not the cause of the wobble.Gear in the streeing does that.I learned from a friend of mine on that.Still wobbles,trying tightening the nut,still does ,so I need a gear I guess. Kevin :shock: :shock: :? :?