These pistons are 73.20, turned down. Piston bolt included, not piston rings.
Cyl.dia STD 69.85 mm.
Comp. height 43.66 mm, flat Piston top.
Piston length 76.99 mm.
Piston bolt dia 15.87 mm. Length 60.00 mm.
Piston rings 69.85 x 3.17 x 3.17 mm.
Manufacture Ateko, Sweden