The SWP Wiring Plate has several pre-drilled hole patterns to mount the Black Plastic Housing used for the ELK-950, ELK 800, M1XSP, etc and the ELK PB1 Project Box which is used to house the M1XEP, ELK-124, ELK PD9, etc. The ELK SWP3 plate will mount the following: * ELK M1XIN * ELK M1XOVR * P212S Power Supply (SWP3 included) * M1DBH Data Bus Hub (SWP3 included)