An implantable device intended to provide a functional and modified connection between existing neurostimulation leads/lead extensions and an implanted replacement neurostimulator [e.g., a spinal cord stimulation (SCS) or a deep brain stimulation (DBS) stimulator]. It typically consists of a small connector block to enable attachment to the existing stimulation leads (i.e., when they do not meet connection design) and connection to the replacement neurostimulator. During implantation, the surgeon uses a tool to tighten the connections (e.g., a Hex wrench) and a medical adhesive to seal the connections from body fluid contamination.