I have 2 unit bearings from a 2wd 2003 WJ. They will work on a 4x4 WJ & JK with the Dana 30 & possibly the 44-but not 100% positive. They have a factory stub shaft in them that can be removed just like in the 4x4 axle.
Great to have in case you break a shaft or a bearing goes out.
$25 each or $40 for both. Can deliver to GATR Claws.