Thank you very much. If it wouldn't be too much trouble could you point me in the right direction for doing this stuff myself? What program might I need for unpacking and such?
I use the FO3Archiver (http://www.fallout3nexus.com/downloads/file.php?id=34) to unpack the BSAs and look at the meshes/textures. I sent you a PM with the replaced Nif. If it doesn't work, simply delete the folder/.nif.
Because of the way Spellbreaker has a special nif for its ward, their may be issues.
EDIT: This will replace the Spellbreaker with the Ebony shield. If you just want the Ebony shield textures over the Spellbreaker, you will need to find a very talented texture artist =P