Great photos but not sure what post is about; are you looking for a metal gasket for new style kick down solenoid valve? That would be for automatic transmission to revert to next lower gear for passing or acceleration? I would just use the RTV gasket compound, metal or other gasket would be negligible as long as there’s no drips.

Metal gaskets for cylinder heads was a common practice for hot rodders as it emulated having the heads milled for higher compression ratio. Have used myself, other than that may be way off here on reply lol......