Mike, you need to do some more research before deciding just a seal replacement is going to solve your problem. I'll just quickly say what you may not know is Toyota redesigned the seal sometime in the past and now the seal lip will be sitting 2mm more inboard. If you just replace the seal and do nothing else, that seal lip will be riding very close to the non-polished bevel of the inner retainer. With a little play in the axle, the seal lip will be riding on the bevel sometimes and it will wear out prematurely and you'll be leaking all over again.

I would read through DrCoffee's thread on this subject for further info and you can watch the video @infamousRNR and I made for this repair.
A possible solution to leaking axle seals