Looks like a bodge from some rear rack part and a bolt and washer.
Aha! Wondered if it was an actual part or just something cobbled together.
Clearly, I need a better spares box.
Not sure if you're aware, Nitto do a similar one that fits their stays (and therefore probably not many others)
@crow started
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Looks like a bodge from some rear rack part and a bolt and washer.