SRAM rear derailleur model changes

Following recent investigations in to replacement jockey wheels for my SRAM X9 rear derailleur, I found that there was lot of confusion as to what jockey wheels fit which SRAM derailleurs.  For example, some suppliers might say "not X9", but there 4 different X9 model changes and also the short cage versions can have different jockey wheels to the long and medium cage models.
This SRAM parts list will help.
Basically, this is when the model year changes on SRAM rear derailleurs...

9 speed
X0 2006-2011
X9/X7 2010-2011
X9 2007-2009
X7 2007-2009
X9/X7 2005-2006
X9/X7 >2004
X5 2008-2011

10 speed
XX 2010-2011
X0/X9/X7 2011

So based on this, the KCNC jockey wheels should fit the following 9-speed derailleurs (pictured below): X0 2006-2011, X9 2010-2011, X7 2010-2011, but possibly not the short cage versions.

2010-2011 X7 9-speed

2010-2011 X9 9-speed

2006-2011 X0 9-speed
(although colour/materials shown here may be only on later models)