Fuel pump replacement:

[NalgeneSF]

Following dr d jet's recommendation, I am planning to buy Bosch 0 580 464 021.
I want an extra fuel pump around to have a replacement in case my original fuel pump fails. Does anyone have any other recommendations for d jet fuel pumps? There seems to be a lot of conflicting information on which fuel pump to get, I even reached out to MB classic center who directed me to get Bosch 001 091 71 01. I wonder if I should get both pumps in case...