[wingnut60]

Yes, that is the NRL bearing--forgot to mention the need for a huge socket, 1 7/16" maybe? And snap ring pliers?
If you are into replacing with new ones, and you can be sure of getting US-made--do all 4 for peace of mind about them for next several years.
My luck with the NRls in my '05 would lead me to keep them if sure of replacement quality--and, of course, if you wanted to change the bearing style then you will need new axles...and hubs, and...?? So, much less costly to stay with them--the ones you have are 6 years old, so probably get 6 more out of a new set....