A spinal implant, comprising: a preassembled combination of a rod, a first implant receiver, a second implant receiver, a first crown, a second crown, a first set screw, and a second set screw; and the first implant receiver having a first rod receiving passageway extending through a first sidewall and through a second sidewall of the first implant receiver in the horizontal direction, the first implant receiver having a first threaded passageway extending in a vertical direction and the first implant receiver including a first base portion for coupling to a first bone screw; the second implant receiver having a second rod receiving passageway extending through a third sidewall and through a fourth sidewall of the second implant receiver in the horizontal direction, the second implant receiver having a second threaded passageway extending in the vertical direction, and the second implant receiver includes a second base portion for coupling to a second bone screw; the first set screw having a first outside thread pattern extending along an outside circumferential surface of the first set screw and having a size and shape corresponding to a size and shape of the first threaded passageway; the second set screw having a second outside thread pattern extending along an outside circumferential surface of the second set screw and having a size and shape corresponding to a size and shape of the second threaded passageway; the first crown having upper curved support surfaces having a size and shape corresponding to an underside of the rod, the first crown being positioned within the first base portion and above the first bone screw; and the second crown having upper curved support surfaces having a size and shape corresponding to the underside of the rod, the second crown being positioned within the second base portion and above the second bone screw; wherein, the rod extends in the horizontal direction through the first and second rod receiving passageways; wherein each of the first and second rod receiving passageways is closed at an upper end of the implant receiver such that the rod is confined within the first and second rod receiving passageways in the vertical direction and in the lateral direction; and wherein the first and second set screws are configured to be rotated within the first and the second threaded passageways, respectively, such that they move downward in the vertical direction and provide a compressive force against the rod such that the rod is in direct contact with side portions of the passageway and constrained from moving in a lateral direction by the first and second rod receiving passageways, and the underside of the rod is in direct contact with the curved support surfaces of the first and second crowns and the rod is constrained from moving in the vertical direction by the first and second set screws. a preassembled combination of a rod, a first implant receiver, a second implant receiver, a first crown, a second crown, a first set screw, and a second set screw; and the first implant receiver having a first rod receiving passageway extending through a first sidewall and through a second sidewall of the first implant receiver in the horizontal direction, the first implant receiver having a first threaded passageway extending in a vertical direction and the first implant receiver including a first base portion for coupling to a first bone screw; the second implant receiver having a second rod receiving passageway extending through a third sidewall and through a fourth sidewall of the second implant receiver in the horizontal direction, the second implant receiver having a second threaded passageway extending in the vertical direction, and the second implant receiver includes a second base portion for coupling to a second bone screw; the first set screw having a first outside thread pattern extending along an outside circumferential surface of the first set screw and having a size and shape corresponding to a size and shape of the first threaded passageway; the second set screw having a second outside thread pattern extending along an outside circumferential surface of the second set screw and having a size and shape corresponding to a size and shape of the second threaded passageway; the first crown having upper curved support surfaces having a size and shape corresponding to an underside of the rod, the first crown being positioned within the first base portion and above the first bone screw; and the second crown having upper curved support surfaces having a size and shape corresponding to the underside of the rod, the second crown being positioned within the second base portion and above the second bone screw; wherein, the rod extends in the horizontal direction through the first and second rod receiving passageways; wherein each of the first and second rod receiving passageways is closed at an upper end of the implant receiver such that the rod is confined within the first and second rod receiving passageways in the vertical direction and in the lateral direction; and wherein the first and second set screws are configured to be rotated within the first and the second threaded passageways, respectively, such that they move downward in the vertical direction and provide a compressive force against the rod such that the rod is in direct contact with side portions of the passageway and constrained from moving in a lateral direction by the first and second rod receiving passageways, and the underside of the rod is in direct contact with the curved support surfaces of the first and second crowns and the rod is constrained from moving in the vertical direction by the first and second set screws.