A spinal bone fastener assembly for connecting and/or aligning a first rod and a second rod, the bone fastener assembly comprising a bone fastener having a bone fastener head and a bone fastener shaft with a shaft axis, and further comprising an elongated connector head for receiving the first rod and the second rod, at least one rod fastener (90a, 90b), at least one bone fastener engaging insert, and at least one rod receiving inlay, the elongated connector head having a head length, a head width and a head height, wherein - the head width and head height define a first head end and a second, opposite head end, - the head length and head height define a first head side and a second, opposite head side, - the head length and the head width define a head top side and a head bottom side, and wherein the elongated connector head comprises - a rod receiving passage extending longitudinally through the elongated connector head between the first and second head ends (21, 22), or at least two rod receiving passages (27a, 27b) extending sideways through the elongated connector head between the first and second head sides (23, 24), - a bone fastener head receiving recess, which is open to the head bottom side, and - at least one locking feature (32a, 32b) for engaging with the at least one rod fastener (90a, 90b), wherein the bone fastener head receiving recess is configured as an elongated or combined elongated channel extending longitudinally within the elongated connector head, wherein the bone fastener head receiving recess has an average channel length and an average channel width, which is smaller than the average channel length, thereby providing at least one translational degree of freedom for the bone fastener along the channel length and at least one rotational degree of freedom for the bone fastener about the shaft axis, and wherein the at least one rod receiving inlay is sized and shaped to be received within the elongated connector head, the spinal bone fastener assembly being characterised in that the at least one rod receiving inlay comprises at least one rod receiving channel (71, 71a, 71b) extending along the length or width of the respective rod receiving inlay, and in that the at least one rod receiving channel is sized and shaped to hold the first rod and/or the second rod in a substantially play-free manner. - the head width and head height define a first head end and a second, opposite head end, - the head length and head height define a first head side and a second, opposite head side, - the head length and the head width define a head top side and a head bottom side, and wherein the elongated connector head comprises - a rod receiving passage extending longitudinally through the elongated connector head between the first and second head ends (21, 22), or at least two rod receiving passages (27a, 27b) extending sideways through the elongated connector head between the first and second head sides (23, 24), - a bone fastener head receiving recess, which is open to the head bottom side, and - at least one locking feature (32a, 32b) for engaging with the at least one rod fastener (90a, 90b), wherein the bone fastener head receiving recess is configured as an elongated or combined elongated channel extending longitudinally within the elongated connector head, wherein the bone fastener head receiving recess has an average channel length and an average channel width, which is smaller than the average channel length, thereby providing at least one translational degree of freedom for the bone fastener along the channel length and at least one rotational degree of freedom for the bone fastener about the shaft axis, and wherein the at least one rod receiving inlay is sized and shaped to be received within the elongated connector head, the spinal bone fastener assembly being characterised in that the at least one rod receiving inlay comprises at least one rod receiving channel (71, 71a, 71b) extending along the length or width of the respective rod receiving inlay, and in that the at least one rod receiving channel is sized and shaped to hold the first rod and/or the second rod in a substantially play-free manner.