Intake Manifold Question

Metal shops will have the thin stainless you need and cheap. I don't know the gauge size but mine are .017 thick. I cut it to fit and used contact cement to hold in place until manifold was bolted on. No issues , 30 years and have pulled the heads a few times over the years , and the stainless plates still look new and no leaks . The intake gaskets 'absorbed' the thin plates. I have to use a gasket scraper to remove them when the heads are off.