I have been using these gaskets for a long time on my CJ5. Dont even bother installing the junk paper gaskets that come with your headers. Purchase these with your new set of headers. They are made of a think metallic material that bonds to both surfaces once the engine warms up. I have had my header bolts back out and drove home 15+ miles. Came home and tightened them up and no leak. The dont crack and break like paper gaskets will. I have even reused them in a pinch after breaking the seal. This gasket will let you do the job once!!! Highly recommend this!!!