Hi i have SLK 32 AMG ( M112 AMG) and i found out i have 3 broken pistons , i own a garage but i have no experience in MB . The pistons inside have code : 9044R0 ( NURAL) and a code below this. The problem is the code below is different between the pistons. i have 12.2 x3 pistons 22.1 x 2 pistons and 23.1 x1 pistons . So i would like to know which one is the correct ? How can i know if its a piston from a non AMG engine or an AMG ? please any advice is welcome.