An implant for insertion between adjacent vertebral members, comprising an implant body with at least one base section and an end cap. The end cap is adapted for selective positioning on a base section via rotational adjustment of the end cap. The end cap comprises an exterior contact surface that faces away from the implant body when positioned on the base section, a seating surface which contacts the base section when positioned on the implant body, an end cap angulation, and locking passages extending between the exterior contact surface and seating surface and adapted to receive base section teeth. The locking passages and base teeth are complimentarily configured to engage and securely maintain the end cap positioned on the base section such that the implant imparts the end cap angulation to an adjacent vertebral body at a selected point when the implant is positioned between adjacent vertebral members.