8pcs Pistons Rings Set Φ93mm For Turbo S 955 9PA M48.50 M4850 4.5L V8 948 103 031 34 996 103 033 51 Car Parts Piston rings set designed for 4.5L V8 twin turbo engine applications. Matches OEM specifications with a cylinder bore diameter of Φ93.00mm. Standard 0.00 specification, intended for use without cylinder expansion. Wrist pin diameter is Φ23mm with a wrist length of 60mm. Ring thickness: first ring 1.2mm, second ring 1.5mm, third ring 2.0mm. Compatible with M48.50 4.5L V8 (4511cc) twin turbo engine models. Package includes 8 piston and ring assemblies. Fits vehicle models equipped with 955 / 9PA engine variants produced between 2003 and 2007. Replaces part numbers 948 103 031 34, 996 103 033 51, 948 103 341 00, and 948 103 031 33. This is not an OEM product. Brand/model references are included solely to assist with compatibility identification.