One of the screws had been missing for some time on my right front auto-locking hub. I took the assembly apart and noticed the grease has turned that muddy brown color that indicates water got in there and mixed with the grease. I obtained the correct screws from a salvage yard. But the tiny rubber o-rings are all worn on every screw. Does anyone know the o-ring size or where I can obtain a reasonably priced set. I want to keep the hubs nice and dry. Thanks.