One pair of Lotus 907 engine camshaft housing / carrier gaskets.  These gaskets were used on early Lotus 907 engines between the cylinder head and the camshaft housing - until about 1974 when they were superseded by anaerobic sealant.  However, they are sometimes useful as a way of addressing valve clearance problems.  If a cylinder head has had its valve seats recut, sometimes the valve shims can end up being in a range that leaves them very thin.  Shims should never be any thinner than 0.060" thick.  I have these gaskets in two thicknesses - 0.011" and 0.019" thick.  If you are finding your shims are at the thin end of the acceptable range, fitting one of these gaskets will allow you to increase the thickness of your shims.