I wouldn't worry about it since there's plenty of gear lube on the backside of the seal. I will probably get criticized for this but as many times as I've removed and replaced my front axle shafts, I've never thought to grease the shaft where the inner seal rides. Never any leaks though. I can see where it would be a good idea though, I'll do that the next time I pull the front shafts. If I ever do again that is since I haven't had any axle shaft problems up front in years lol.
When you have a choice, buy American.