u, ut2, uax, usx, utx
I think that's it.
ogg isn't a required package. ukx/upl are player/vehcile models/anims, I dont think the ece one's are needed on redir. If you dont have ece it wont dl from the server anyways. Adding custom models would be redundant. ucl is beyond me, seems like a local cache of the map info.