When in wonder google just may help !  A quick search of this model number 
revealed this link :
http://www.velobase.com/ViewComponent.aspx?ID=799B9408-3493-4BC2-BAAD-CE435E385B78&Enum=115&AbsPos=0

For use with a D3-SS 121.5 mm bottom bracket with 5 mm drive side offset 
> axle, or the more readily available *symmetrical *UN54* 127.5 mm* 
> cartridge bottom bracket


 So a current UN55 127.5 would work just fine, or Tange and other brand 
equivalent.  Most disposable cartridges follow the Shimano offsets per 
given axle length. 

cheers !

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