An implant configured to be interposed between opposing faces of two bones to be fused together, the implant comprising: a spacer configured to fit between the opposing faces of the two bones to promote fusion of the two bones, the spacer having a forward portion, a rearward portion, a top portion, a bottom portion, and two side portions; the rearward portion comprising at least one cavity, the spacer having at least one spacer channel extending from the rearward portion to at least one of the top portion or the bottom portion; and characterized by a fusion plate (54; 200; 500) coupled to the spacer via a threaded connector, the fusion plate comprising a main body portion (40 1; 50 1) and a first extension side portion (408; 508), the main body portion comprising a forward face (402; 502), a rearward face (404; 504) opposed to the forward face, and a sidewall (406; 506) connecting the forward face and the rearward face, the forward face and at least a portion of the sidewall to be received in the at least one cavity, the first extension side portion configured to extend beyond at least one of the top portion or the bottom portion of the spacer, the fusion plate comprising at least a first bore (412; 512) aligned with the at least one spacer channel and extending from the rearward face to the forward face of the fusion plate and a second bore in the first extension side portion extending from the rearward face to the forward face; wherein the threaded connector has a first end and a second end opposite the first end, the first end of the threaded connector having external threads (T 2), the second end of the threaded connector having outwardly turned lips and wherein the spacer comprises a threaded spacer bore in the at least one cavity and the fusion plate comprises a fusion plate bore having a shoulder, the fusion plate bore being aligned with the threaded spacer bore, such that the fusion plate is coupled to the threaded connector by causing the outwardly turned lips to engage the shoulder and the threaded connector is coupled to the spacer bore by threading the threaded connector into the threaded spacer bore whereby the spacer and the fusion plate are connected. a spacer configured to fit between the opposing faces of the two bones to promote fusion of the two bones, the spacer having a forward portion, a rearward portion, a top portion, a bottom portion, and two side portions; the rearward portion comprising at least one cavity, the spacer having at least one spacer channel extending from the rearward portion to at least one of the top portion or the bottom portion; and characterized by a fusion plate (54; 200; 500) coupled to the spacer via a threaded connector, the fusion plate comprising a main body portion (40 1; 50 1) and a first extension side portion (408; 508), the main body portion comprising a forward face (402; 502), a rearward face (404; 504) opposed to the forward face, and a sidewall (406; 506) connecting the forward face and the rearward face, the forward face and at least a portion of the sidewall to be received in the at least one cavity, the first extension side portion configured to extend beyond at least one of the top portion or the bottom portion of the spacer, the fusion plate comprising at least a first bore (412; 512) aligned with the at least one spacer channel and extending from the rearward face to the forward face of the fusion plate and a second bore in the first extension side portion extending from the rearward face to the forward face; wherein the threaded connector has a first end and a second end opposite the first end, the first end of the threaded connector having external threads (T 2), the second end of the threaded connector having outwardly turned lips and wherein the spacer comprises a threaded spacer bore in the at least one cavity and the fusion plate comprises a fusion plate bore having a shoulder, the fusion plate bore being aligned with the threaded spacer bore, such that the fusion plate is coupled to the threaded connector by causing the outwardly turned lips to engage the shoulder and the threaded connector is coupled to the spacer bore by threading the threaded connector into the threaded spacer bore whereby the spacer and the fusion plate are connected.