The Radium fuel pump hanger allows the use of 1 or 2 aftermarket high-flow fuel pumps and is compatible with the following models: 

93-07 Subaru Impreza (including WRX & STi)
97-08 Subaru Forester (All)
89-99 Subaru Legacy (All)
94-99 Subaru Outback (All)
05-06 Saab 9-2X

The machined assembly mounts in the factory fuel tank using the OEM gasket and hardware. The fuel level sender and temperature sensors are retained, as shown below.