Just a heads up, that anchor roller looks identical to my 2900 anchor roller which only had a small danforth style anchor with a straight shank. The ring on mine would not have been large enough to pass your plow anchor shank.
You may have to fab something up. The original is just a “U” shaped strap of 1/2”-3/4” wide stainless about a tenth to an eighth of an an inch thick. It actually attaches to the anchor roller bolt and not the open holes. I never liked that the single attachment point would allow it to move around, but adding a second bolt through the open holes would required chamfering and sinking the bolts flush so it didn’t interfere with the rod so I never did it. Maybe you can find a better solution.
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