Kit of 8 engine pistons, model A2780302317 and 2780300100, designed for engines with a cylinder bore of Φ92.9mm and wrist pin bolt diameter of Φ24mm. The wrist pin bolt length is 56mm. Ring thicknesses are 1.2mm for the first ring, 1.5mm for the second ring, and 2.0mm for the third ring. This piston set is compatible with vehicle models X166, W166, W221, W222, including variants equipped with 4.6L and 4.7L engines. Suitable for use with GL500, S500, M278, GLS500, E500, ML500, and similar applications where these specifications apply. ote: This is a third-party compatible part. Brand/model citations do not imply sponsorship or approval.