Most bearing/seal suppliers can supply or likely on-line can be found ,need to mic shaft and find a suitable size sleeve for the shaft size I'm not sure how small they make them usually they are near the end of the shaft as the supplied installation tool only has a short reach. Sometimes a homemade installation driver has to be made to drive it on far enough . How bad is your shaft in the seal area? Is it pitted or worn so far under size that the seal is not making contact ? As someone said on a earlier post perhaps you can move the seal one way or another or add the second seal if not done already. A good machine shop could likely repair this shaft several different ways. One way would be to see what the next bigger ID seal with the proper OD would be and have a sleeve made to fit over the shaft with a slight interference fit and warm it up and slide it in place . As you mentioned earlier is the seal/seals in the right direction . good luck ,hope some of the posted info helps !
