I have a rear bumper that I believe fits a 60-63. It came to me on my '65 and I have since bought a new bumper for it. The one I have for sale is not rusted and looks great. I can send a picture if requested.
I still have the rear bumper and the holding brackets for a '63, great condition. Looking to get $200 for it. (405) 550-7685.
I will be dragging my family half way across the country to pick it up soon. Looking forward to meeting you.