This is the proper Nikon part, but has the wrong +/- factor. You want a 0. You might want to go to a local camera store and do a special order. I'm sure you could do this over the phone. The purpose of the diopter is JUST to hold the rubber cup to the plastic viewfinder clip. It is threaded and locks CUP & CLIP together.
My Nikon dealer here in Los Angeles, has a plastic tub just filled with these viewfinder do-dads. It is a part for an old series of film cameras. I wouldn't throw a Hoodman product into the mix. Stay with Nikon.