I don't think you'll find any ready made replacement part for just that piece, but there are threads in the community that discuss how to make replacement cables for similar robots from other sources.
http://www.robocommunity.com/forum/thread/16970/Broken-hand-cable/?
http://www.robocommunity.com/forum/thread/13172/V2-s-left-arm-cable-repair/?
ScottE -- collecting and building robots for 40 years - details in profile
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