An inter-vertebral-body (IVB) spacer may include a skeletal body and a pair of interchangeable contact pads. The skeletal body may be made of a rigid material for providing structure support, and the pair of contact pads may be made of a softer material for contacting the endplates of the vertebral bodies. Advantageously, the IVB spacer may be strong enough to withstand the pressure applied between the vertebral bodies yet soft enough to protect the vertebral bodies from being eroded. Moreover, the IVB spacer may have an inter-pad angle, which may be adjusted to adapt to patients with various vertebral bone structures. The inter-pad angle of the IVB spacer may be adjusted by simply selecting and replacing one of the contact pads.