I was able to secure an FT170 Vincent sidecar bracket. I think this transfers to left or right if needed.
I am still looking for help on purchasing or fabricating a right side sidecar chassis that will allow a period style sidecar body that looks correct.
Do you need a shorter upper Girdraulic link in addition to rotating the eccentric for increased spring preload/rate.
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Thanks for posting the picture of that bracket. I had no clue what that thing was rattling around in my odds and ends box. I can put it to good use now.