1971 Dodge demon 340 4sd, factory roll back top...ever seen one like this?

There was one in my area during the early 80's. It ended up in a scrap yard.
I bought the third member (3:91 SG), for scrap value. I paid like $15.00 for it.
The toughest part was climbing the 3-4 stacked cars to get to it.
The top was missing from it, other than that it was still intact, 340 & all.
Probably could have goy the whole car for near to nothing.