well its preaty much what it is i know there aluminum ones out there and they have to be special ordered but cant find them also if any one knows how to find out if a car has cast iron or powdered metal connection rods id like to know how with out taking it apart ive got an earlie 04 gp gt built 11/03 and i know gm was supposed to put the powder metal in them all but some got cast iron and some got the powder thank you for your help every one