Mmm, the ends of that brushroll shell don't look too bad. they crop up brand new either genuine or pattern on ebay alot.
Quick test bodge though, wrap some electrical tape around the outer shell of the bearing, just so it's a tight fit into the end of the brushroll, it won't need much. Does it quieten down?
If it does, buy a pair of brushroll bearings from Stuart, repeat the packing out with tape and job done!