If the seal is installed to far in it will leak. The seal you got from the dealer is the updated seal with better material. Sometimes the transmission housing can get nicked removing the old seal. If that happened you can drain the gear oil & clean the area with brake clean until no oil is leaking out. Add some silicone to the outside diameter to the seal. Install the seal & let it cure for 24 hours. I can get a measurement of the seal depth installation for you this afternoon when I get home from work.
