basicly, you need to cut the metal pipe which your std pump connects to on the housing, then use a small length of hose and two clips to connect the 023,

the important bit is to measure the tank depth, and make sure the 023 intake (bottom of pump) is around 5mm from the bottom of the tank, you can adjust this gap by trimming the above pipes.

secure the pump to the housing with a big jubilee clip around it onto the metal pipe.