Three ring piston ring set for one 83mm piston as used in Gilardoni kits for many 850cc engines including Ambassador, Eldorado, 850T, 850T3, 850 LeMans, LeMans II, 850 LeMans III, 850 T5. These rings are interchangeable with original Guzzi code 14060655 and 13060600. Iron rings are suitable for plated or iron bores. ~4mm thick 2 piece oil ring, ~1.5mm thick scraper middle ring, ~1.5mm thick compression ring. Please measure your current ring thicknesses to be sure these are compatible before ordering. For example, original Eldorado piston rings use thicker rings, but Gilardoni replacement cylinders for Eldorado use these thinner piston rings.