i went to install a new head gasket on my car and the dowell pins aren't right on the gasket. do you have to do any modifications to the ls head gasket to make it fit? or did they perhaps sell me the wrong head gasket. it looks correct, except that the dowells are on the wrong side. the one that was on the car has a hole big enough for dowels on both sides. i bought the car, so i wasn't around for the initial installation and i'm a little confused.