Crank arms for shimano

Does anyone know where I could possibly get hold of just a left side crank arm for a shimano FC M521 175mm Crank.
Any help appreciated as I have cross threaded my pedal on the left side and totally k-nackered the arm :oops:
Any help appreciated as I have cross threaded my pedal on the left side and totally k-nackered the arm :oops:
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