nv4500 leaking, input seal?

Need some help fellas. Just did the manual swap in my truck, now the tranny is seeping fluid. Its coming out the crack in the bellhousing so we've pretty much decided it is more than likely the input shaft seal. I've called Napa and autozone and neither place has the seal listed. Anyone know where else to get one? Gonna call the local dealership tomorrow to see if they have one.

Also, anyone else ever had the seal start leaking?