I have a 1966 Ford 4500 industrial tractor with a 755 backhoe attached. I decided to remove the backhoe for the winter, failed to loop the hoses together and blew the Vickers vane pump apart on the front of the tractor. I have found the vane pump is no longer serviced and have not been able to locate the correct replacement. Several NH dealers and local hydraulic place were not much help. I see online that a d1nn600b might be a replacement but I also see it might not be the right orientation for pipes. My pump has a 1-1/2in. inlet similar to a radiator hose and outlet is a 4 bolt split flange with a 3/4 port. Shaft is a 13 spline and CCW rotation as you look at the pump shaft. I believe it to be a 28gpm pump. I would like to know the original p/n of pump and the displacement so I can find the right one or if someone knows for sure the correct one. The Vickers vane pump number is V3-1F-17G15B-20-L. I think the original p/n was a 10C01 and the conversion p/n is a 309929 both are obsolete according to new Holland dealer. Any help greatly appreciated.