Tim -
No, that isn't what we are looking for. The picture on the TM site shows the same coupler that I have on my 2020 2720QS. There is no bolt. And the "curved u-shaped wire portion" is actually not a silvery wire or a bent metal rod, but is simply the new-and-glossy edge of the upper metal part of the cup.
The first pic was extracted from the photo you referenced on the TM site. Clearly no bolt, but the "curved u-shaped wire portion" seems clear. The second pic is my hitch, with a bit different lighting and some dust on it. A closer look confirms that the u-shaped wire is actually the glare from my garage ceiling lights, reflecting from the edge of the raised cup.
Bill
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