When OEM parts suppliers stopped producing these we went to work and created our own upgraded billet design! CNC machined aluminum with generous radius means no fighting to get your head on and scratching your freshly machined deck surface. These tap into the block with a light press fit and securely locate your head and gasket. Work with ARP Head Studs and stock bolts. Unlike OEM style these also will work with milled heads and are re-usable. Sold as a pair.