New OEM thermostat housing base and top outlet housing. Fits Datsun 240Z 1970 to 1973 and most 510s 68-73 and 620 trucks with minor mods. This housing bolts to the block & the thermostat sets in it. Has provisions for 2 threaded fittings for the included top. Gaskets included. Free shipping to the u.s. lower 48.