Correct fuel pump for 1969merc200 20hp

[Davesthe14u]

Does anyone know the correct type fuel pump for 69 merc200 20hp. my motor had one type of fuel pump but I have found another 69merc200 20hp with a different type which mounts to a bracket that my motor has.
The pump on the left is the one on my motor currently.

 

[Davesthe14u]

This is the pump that would mount to the bracket on my motor