An upgrade kit for an original roll-bar of a historic single-seater car, comprising an additional roll-bar with the shape of an inverted U or V and identifying second two ends operatively lower, and wherein each of said second two ends is adapted to be associated with first two ends of said original roll-bar by means of reversible connection means and at least one additional bracing rod adapted to be connected between a vertex of said additional roll-bar and said frame or an engine block of said historic single-seater car; the additional roll-bar being operatively superimposed to said original roll-bar.
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