New old stock OEM Honda. Comes exactly as pictured. Set of 4 pistons, no other parts included. STD bore 58.5mm. Genuine NOS OEM parts. 

For: 

CB550F-K2 1975 550 550 Super Sport Street

CB550F-K3 1976 550 550 Super Sport Street

CB550F-K4 1977 550 550 Super Sport Street

CB550-K0 1974 550 550 Four Street

CB550-K1 1975 550 550 Four Street

CB550-K2 1976 550 550 Four Street

CB550-K3 1977 550 550 Four Street

CB550-K4 1978 550 550 Four Street

In stock and ready to ship.

SKU: NOS4 Box2