Special Order: MBXL VERT RCPT 3ACP+16S+2P PCB Connector Type: PCB Mount Receptacle PCB Mount Orientation: Vertical Connector System: Board-to-Board Number of Positions: 21 Number of Rows: 4 PCB Mount Receptacle Vertical Board-to-Board 21 | PCB Header & Receptacle | Part Number: 2-6450550-4 | Internal Number: 2-6450550-4 | TE Connectivity