Look like the Diamond D chest rig,I have one for my Model 5032. That's the 1 piece barrel chambered in the 45acp/45 Colt.
Very handy thumper with my ++p 300 grain cast/powder coated loads.
I believe the problem is/was, that Pachmayr didn't know their Redhawk square butt rubber grips will actually fit on the round butt Redhawk grip frame.
I contacted Pachmayr, told them they DO fit, but they will need to perform some fitment testing and then update their website.
I even sent them links for photos. The Pachmayr "wheels of progress" apparently roll slowly.