Steering column help needed!

i recently picked up a 1970 dart as a project. I tore down the steering column and replaced the ignition switch wire and new key and tumbler. Thanks to the how to sticky on here. However I ran into an issue. I'm not sure how it was rigged but I'm missing the last piece that the steering wheel bolts onto. This is what I have and all I have left is the steering wheel. I don't know the name of the piece or any idea how to find one. Please help!