Genuine NOS Mercedes with the star logo INA F-51675 Water Pump with a 4 hole pattern. Looks similar in size to other pumps I have but the mounting plate section is different. Please study the photos.
It is 5.25 inches long with the shaft protrusion.
It has 115201 and then they drilled for the bolt hole and then a 0, so it’s probably 1152010110.

It also has 121 201 C1.07 stampings on top where the blades are.
If you need any further measurements or pics let me know.