Three ring piston ring set for one 88mm piston as used in Gilardoni kits for many 1000cc engines including Convert, 1000 SP, V1000 G5, big bore for LM1. These rings are interchangeable with original Guzzi code 18060601 California II, California III, Mille GT, 1000 SPII, SPIII, Strada, 1000 Quota, LeMans 1000, and 1000S, and substitute for 17060660. Iron rings are suitable for plated or iron bores. Rings measure approximately: ~4mm thick oil ring, ~1.5mm thick scraper middle ring, ~1.5mm thick compression ring. Please measure your existing ring thicknesses to be sure these are compatible with your pistons. Measurements are +/- 0.05mm.