I'm the OP on this thread and am awaiting shipment of the same Nikon parts. D-19 and D-22.
Without seeing the items, I remember from film days that Nikon eyepieces generally required stretching the rubber eyepiece over a circular flange on the mount. This requires some pulling and forcing. And it helps if the rubber eyepiece is warm. If you live in a cold place, then bring some water to near boiling on the stove and soften the rubber by immersing in the water briefly.
The mount (D-22) then slides onto the slot on the D7000. Of course you have to remove the present eyepiece from the camera.
I think. My parts won't arrive until after the 1st of the year. Unless someone else with this same equipment can suggest how it's done.