This saw came to me as 2 torn down 353s in a box. I managed to get one of them working well. This one came to me without a seal on the PTO side. I ordered some 353 seals on ebay (aftermarket) but they seem wrong. It will fit snugly( think) around the crankshaft but there's a big gap at the outer race of the bearing? Are my seals wrong or is something strange about that bearing. Thoughts?