A precisely size matched intervertebral plate and spacer assembly for ensuring a tight fit within a disc space to promote spinal fusion, comprising: a “U-shaped” spacer configured to fit within the intervertebral space and, a matching countersunk low profile “H-shaped” anterior plate joined perpendicularly to the spacer. The plate further comprises: a plurality of anchor members configured to attach to the junctions of the anterior cortex faces and the endplates and, channels individually traversing through the anchor members for inserting screws into the vertebral bodies cortical bone. The spacer comprises a hollow three-sided U-shaped member, comprising two opposing parallel side walls, and a perpendicular posterior wall, while lacking a superior, inferior, and anterior wall. The exterior walls of the plate and spacer are planar, while the interior walls of the spacer are curved to house a precisely fitting cylindrical graft, or other insert such as DBM, bone dust, bone paste, bone dowel with direct contact to the endplates to promote fusion.
