You will likely ruin the seal, when removing it, to access the rear bearing. It is best to replace seals. You can take the numbers off the axle placard, and call axle manufacturer, with that info. They will know what seals, by the numbers on axle, and can sell the proper ones to you, or advise where to purchase.
Also, a good bearing/seal parts supply can likely match them up. I like having the proper new ones in hand, before removal, but that's just me.
Lots of opinions on use of EZ-lube feature. I have used mine, with no issue, but have hand packed initially to know what grease is in there.
Jerry