Someone else showed a fairly simple adapt before. He used a piece of steel 4 inches long maybe wth a hole drilled in each end. The factory bolt went in one hole and a nut and bolt held the retracter to the other end. That bolt was extra long and a hole was drilled to let it into the rocker. That keeps the piece from rotating on the original bolt. No cutting or welding was needed.
Looked fine to me.