This is what I came up with for a rider's backrest. The pad was purchased at amazon - https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1. The metal hardware from Homedepot - https://www.homedepot.com/p/Simpson-...-66T/100374961. https://www.homedepot.com/p/Simpson-...HRS8/100374841. Bolts and nuts from what I had on hand.
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