Best advice is take crank with bearings to engine specialist like Engine services at Dunston (john) and get him to measure it and they can supply the bearings etc,it may be a good bet at this time to overhaul it completely even though it may cost a fair bit its good policy at this stage,last time I asked him all the bits and pieces were about £200.
As Bonzo says its not worth messing about with oil seals as they come in the head set and dont forget the valve seals.
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