Replying to this so I can find it again if I ever find the correct luggage rack for my '79. The mounts for the turn signals are the sticking point in adapting any earlier year racks. If I do find a rack, I'll be willing to part with the grab bar, as I live in a motor home and don't have room to store spare parts.
Currently about 60 miles east of you in Dardanelle. Is your bike running, or in the project phase?