Thanks for the info Dave and Scram,....at least I know what I have now.
After mocking the smaller one up, it would be easy to mount behind a solo seat IF I was willing to drill holes in the fender above the brace, but don't think I want to do that.
Right now I'm fighting a seat pan from a 750 Shadow seat to see if I can make it work (too much flip at the rear)
Rear Luggage Carrier
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