one final piece
definitions
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The last individual part or component required to complete a physical whole, such as a puzzle, a model, or a collection.ru: Последняя деталь
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The last necessary element, detail, or step required to complete a complex task, a plan, a theory, or a situation.ru: Последний элемент
examples
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I finally found one final piece of the jigsaw puzzle.
Я наконец нашел последнюю деталь пазла.
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This new evidence is the one final piece needed to solve the mystery.
Эта новая улика — последний элемент, необходимый для разгадки тайны.