This Digi-T kit fits the following line of CP cameras: 800, 900, 950, 990, 995, and 4500. The "kit" consists of their basic Digi-T ring and an adapter/step ring for coupling to your camera. It is part # STDT1.
Both pieces are in very good condition w/ only minor brassing in a couple of places from use. Scopetronix sells these for $60 plus s/h. Asking $40 shipped in ConUS.