Can someone tell me where to get the other peices of the equalizer sword? Thanks!

The other peices are both found in the underdark.
The pomel is in the Illithid lair hidden in a wall stash in the room located ~ middle top of the screen.
The blade is in the Beholder lair.. forget where.

Both these areas are acessable from the SE corner of the main underdark caver.

Hope that helps.