The Mahle drop-in piston ring set for a 3.551 in (3.551") bore includes 1.5 mm top and second rings and a 3.0 mm oil ring. These drop-in rings are supplied to restore cylinder sealing and oil control during engine rebuilds or piston replacement. They offer direct-fit sizing where a 3.551" bore and the specified ring thicknesses are required for correct ring gap and installation.
Mahle MS 3.551in 1.5mm 1.5mm 3.0mm Drop-In Rings