I used a rubber mallet and a cheapo amazon bearing driver kit to drive the new seals in. From what I recall there is no exact size in these standard kits. I put the new seal in the freezer and used the closest size and lightly tapped in circles to drive it in flat. Also greased it before driving. It went it pretty easily.
I did the same, but the driver's side just decided to go in cockeyed and it wouldn't straighten out. It just caved in on the part that was stuck against the axle housing wall when I tried to coax it in further.
Oh well, like I said, not a huge deal. It's all better now!