Have a '66 4201 fuel pump for sale. This one may be NOS, but not sure. At the very least it is a Ford re-built pump. The reason I say it might be NOS is because the "nub" at the top still has perfect gold zinc plating which is usually blasted during a rebuild.
The pump has 'CARTER' on the side, so it is the later replacement. It has both springs in it, one on the arm and one up top under the 'nub'. The plating condition isn't the greatest on the bottom portion, but would be presentable once installed. The pump has "4201" stamped on the bottom.
This is a real Ford replacement hi-po fuel pump for a 66-67 K code. Can send pics on request. Would like to get around $750 for it.