VJ14 Bolt Spacing: 2.178" x 2.178" (55mm x 55mm). VJ14 Port Shape: Single Port 1.76" (45mm) ID. T25 Inlet Bolt Spacing: 1.575" x 2.874" (40mm x 73mm). T25 Port Shape: Single Undivided Port. All our products are CNC milled using the latest CAD/CAM programs which are built in house on 3 and 4 axis high precision machinery.