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@sqvrt
Half answering my own post I know, but I found some good images of the various Nitto track bars on this site:
http://www.businesscycles.com/tbars-nitto.htm
About 2/3 down they've lined up the B127, B125, B125AA, B123 and B123AA clearly showing the different drop and reach of each model and also showing the difference in the finish between the very shiny steel bars and the less-shiny AA (aluminium) bars.