Put together a complete ms660 recently with these parts from either huztl or machinedr... same parts from farmertec in china... quality seemed ok on the tank.. didnt pay a whole lot of attention to the thickness but everything fit and lined up.. depending on the tank your looking at if it has any orange on it I wouldn't expect it to be a perfect match... you also have to torque the cap pretty well to get it to seal.. but it works.. If your looking for a cheap replacement to get your saw back in service then these are great... if your looking for something for a show saw you won't find it with these...