2MM FB,ASY,048,SIG,REC,SL,2.73 Connector System: Board-to-Board Row-to-Row Spacing: .079 in Row-to-Row Spacing: 2 mm Number of Rows: 4 Number of Columns: 12 Board-to-Board .079" 2 mm 4 | Backplane Connector Housing | Part Number: 5536507-2 | Internal Number: 5536507-2 | TE Connectivity | Z-PACK