How to get the source component from which the opposite hand version mirrored ?

HI Guys, 

when travesing the assembly design tree, get every component, and when reach the one was under the mirror feature, and it was the opposite hand version , I need to get its mirrored source component, want to know which part or sub assembly it mirrored from, do you guys have any suggestion ? or which interface should I use? 

pls help to advise.

thank you very much.

regards

Vincent

SolidworksApi/macros