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Caliper piston : FRONT : 42MM (1012)
One of the 42mm BRAKE Caliper pistons, Fits front on many Z models 1979-1981Z400J1 Z440 Z550A1 Z650 Z1000A3/A4/H1 Z1000E-ST Z1300THIS IS THE PISTON WITH THE INSULATOR IN THE END OF IT.