Andy spotted this one. Appears to be missing the arms and the driveshaft (1955 brochure)?
https://www.facebook.com/marketplace/item/1139549280742202
“Up for sale is a Roper Post Hole attachment that I believe goes to a Willys Jeep. Was on our property when we bought it, so I don’t know much about it. Auger wiggles at gear box, so believe gear box is free. What you see is what I have. Will sell to the best reasonable offer”