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The water pump I got from the New Holland store (model # CDPN8501A) has a spacer drum cast integral to the pulley. The unit that's on my tractor now has a sheet steel spacer drum that's rivetted to the fan then bolted to the pulley. The new unit lacks a port hole in the backing plate that my current unit has. Has anyone had experience with these new versus old units? All the units online have the same part number, but each is slightly different.