Back on topic, I contacted Chicago Rawhide seal Manufacturer. I gave them the National #472920 and he said their "grease seal" is #22558. He was busy doing 4 peoples work so he said he would get back to me with the proper oil bath seal #.
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2015 RAM LongHorn Dually Air ride Aisin 4:10's
2016 MS 39TKSB3 "Highly Elited"
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