I am having trouble finding the seal (replacement) where the yoke for the front drive shaft connects to the differential. Any help please?

 

that would be the pinion seal.
go to Advance and order a National brand seal. its the best, and the cheapest. They'll have it same day or within 1.
Napa's SKF seals are good, but more expensive.

avoid Timken seals from Autozone or anywhere else. they suck and they leak and they're the most expensive.

 

Thanks!!