Need Help Guys

I must live in an area with a bunch of idiots. I have gone to napa, autozone, advance auto parts, and a few dealers. I need to replace the output shaft seal on the tremec 3650 in my cobra. Nobody has any idea what I am talking about at those parts dealers. I don't know if it doesn't show up in their computers correctly or what. Does anybody have a part number? Any good places to order from? Thanks for the help