Standard - 4.2 Liter Engine W/ Original Pistons: Top ring width: 2.00mm Ctr " " 2.00mm Bot " " 4.76mm AE Piston #'s 18395,K 19885,K EAC 20425 - Standard W/ Original Pistons: Top ring width: 2.00mm Ctr " " 2.00mm Bot " " 4.76mm AE Piston #'s 18395,K 19885,K EAC 20425 -