I wanted to follow up and let anyone who has similar fun times how the stern scoop rub rail replacement went.
I did order the rub rail from Ward at Beneteau parts that jibstay suggested. The new rub rail worked on my Dufour perfectly.
The groves on the inside are for adhesive
per Ward. We did not use any adhesive
due to the tight fit and not wanting 5200 all over the place.
We had to use a heat gun and slowly warm the rub rail to work it onto the lip. This is thick PVC/Rubber and very stiff. We elected to use fasteners. It took about an hour to work it around the stern.
Looks good and thanks for the help finding a source.