Ruger made the MR-3DB Dragoon Super Blackhawk size with the square back trigger guard.
Some in very limited numbers ended up on the Blackhawk, in various calibers, more ended up on Super Blackhawks, and most were shipped on Old Army's.
One could buy a Frame & Trigger as a kit to use on your "whatever."
Ruger had fitting problems with the brass blending into the steel and showing up in the bluing.
Also had huge porosity problems in the casting process, no one knows but it has been rumored that more ended up in the scrap, than on guns,,, again nobody alive really knows.
Finding a Ruger Brass Grip frame without some porosity is rare, seems they all have an "acceptable amount".
Average $350 +/- $50, with the Super wide grooved trigger +$50 +/-$15
Qualite/MK was the largest aftermarket manufacturer, and I don't think anybody other than Milt & Karen, and not so sure they would even know. Originally sold ~$100, Now bring $250 +/- $50