Might go power steering on the D100. Is the column the same between manual and power steering on a 77 D100? What about the extention shaft between the rag joint and the box? Also, what columns are bolt in to a 77?

The lower shaft is different length. Check Borgeson for a replacement shaft. Iirc theirs are adjustable.

I looked again and the lower extension shaft as I put it is actually the manual box shaft with the rag joint bolted to the end then column. So the columns are the same I just need a box and a pump?