Ferrari Part 2 D 10-UNI-5588 Nut in Ferrari 365 GT 2+2 (Mechanical) (Mechanical Table 012 Timing Tensioner, Accessories)

Ferrari part number 2 D 10-UNI-5588, NUT, shown here as used in a Ferrari 365 GT 2+2 (Mechanical) (Mechanical Table 012 Timing Tensioner, Accessories).