From the article from Franco Nugnes, who often isn't reliable:
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This is not true. All the three components will be introduced as late as possible, before September 1st.The achievement of certain duration targets also leads to the introduction of a modification in the hybrid system:
the new MGU-K should make its debut in Miami, while the ECU and battery will certainly arrive before the homologation limit set by the FIA for the month of September.
Source: Giuliano Duchessa , the most reliable Italian F1 journalist.
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