BMW Repair: fuel pump, fuel pumps, 535i

Question
1988/535i/wbadc74047j1719590. I am searching for the location and what part number of the fuel pump.

Answer
There are actually 2 fuel pumps.The primary pump in the tank and the secondary(main) pump is under the car next to the filter right side of the car.
The part numbers that I have is GFP263,and the other is 16141425S.These numbers come from Bavarian Autosports 1-800-535-2002