p.s.: I never really checked the diameter of the Nicson's pump pad to see if a fuel pump, such as an Enderle, will seat there and be able to take the new drilled/tapped holes for pump mounting, so be sure to check that out.
On the other hand, if you intend to put a waterpump there, such as a Nicson or Neovane waterpump, then our Hex Drive won't work because it's a 3/8" hex drive specifically for injection pumps like Hillborn, Enderle, Kool, Crower, etc. You'd need the waterpump drive from Rex Marine.
