Rear Wheel Bearings for IRS cobra

i replaced the front hubs in my car a couple months ago, and i feel like the rear wheel bearings (at least on one side) are starting to go too cause it seems a bit noisy, even for my car.

i have a couple questions though, where do i find these bearings, they dont really show up on a parts search as easily as the front hubs. how difficult of a job is this? can i do this myself like i did the fronts?

my car is a 99 corba with the stock IRS


i guess if this doesnt get enough traffic i will post in the regular 4.6 tech section.
 
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