CJ Classics Steering Column Install Help

[BrentBTK]

I ordered a CJ Pony Parts Steering column for my '71 C15. I don't understand how the 1"DD end of the column attaches to the universal joint on the intermediate shaft. The old shaft is round and splined, the new one is the DD. Pic below. This is the stuff that grinds my gears. Says its a column for my truck, and it does not bolt in. There is also no provision for a neutral safety/backup switch. Pic of the ends below. How did someone who has had this correct it?