This is a very hard to find original fuel pump for a Fairbanks Morse Y oil engine.  I think it is used on the Y and YH styles in various sizes but please do your homework to be sure it will work for you.  It is in pretty good used condition with no cracks, breaks, or repairs but the plunger is stuck.  It mounts with two holes 3 1/2 inches apart on center and is part number YF145C.  After a little elbow grease it should be ready to be put to use on an engine!  The pictures tell the story.  These fuel pumps are extremely hard to find in the wild or even in the collector network so if you need one here is your chance.  You won't be disappointed in any way.  I can be reached at 262 573 1931 if you'd like to talk about it.  Good Luck.