I had a 1.2 mm his mhg in my engine until it died. Now I am getting the block decked and need a bigger head gasket. I have an extra mhg in my garage that has been used. The rivets are not in it so all the layers are not connected. And I have no idea what size it. It has 4 small metal layers and one thicker layer. Does anyone know what size it is? Also what is the order of the layers? I was thinking two thin layers then big layer in the middle then the other two thin layers. Thanks