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I suspect that these are more about aero then sealing. Sure you could try a modern dust seal, perhaps take the hubs to a good shop and test fit from their misc take offs box. I've seen some use common O rings, often a few stacked along the axle to provide some contact with the cone and inner sealing thing (hub shell dust cap usually). IIRC the cones have a sealing design anyway, if so then these dust covers are redundant. Andy
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AndrewRStewart