We can confirm this issue has now been resolved. Anyone who was affected by this will receive a player inbox message with the correct fusion part. 

Thanks again for your patience and understanding.

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We're aware that players are receiving random Epic Fusion Parts after completing Race 21 of ART5: Finale, Los Angeles.

Our team our working hard to fix it. Please check this page from time to time for further updates.

Thanks for your patience and understanding.