As some of you may know I need a new head gasket. I'm looking into buy a comedic triple layer one. Only problem is cometic seem to make head gaskets for every engine code apart from the AUM engine. Mine is a AUM 1.8t 2001 model. Are all engine codes the same measurements head wise or have try different measurements? Can I use a similar engine code from a 2001 a3 1.8t?