personally, i found #6 and #14 is amazingly good shape on my 140K-mile ZHP - they are generally understressed.
that said, the outer bushings were toast. i would recommend replacing both upper and lower outers with #2 in the diagram.
as for a tool... the koch tools subframe bushing tool is amazing - with a universal bearing/seal driver set (harbor freight special), you can do every bushing in the car. they also have a RTAB and rear diff bushing tool that could potentially work for replacing these bushings.
http://www.kochtools.com
peter
2004 330i ZHP
2005 330iT ZHP
2010 328iT M Sport