Mike C. sent me a link to this Scout II Dana 44 Rear Disc Brake Conversion Kit, which is several hundred dollars less than I’ve seen in other places. This is on the list of things I’d like to do to Peer Pressure when money isn’t so tight.
Update: looks like the original vendor is gone. I’d go with a couple of the Light Line vendors instead–both of whom have been active in the IH community for years:
D&C even has an instructional video, which is excellent.