Finally got this done and got to use it, worked well for me. I even ran the rake at an angle a couple of passes and used the end plates to scarify some short/shallow ruts, probably too much side pressure on them to do that often, but only had my rake with me on this last trip. I can see where windrowing might be beneficial sometimes, but majority of time not what I want. The plates left a nice edge of material where I wanted it.
Can’t seem to attach a pic, but the picture is pretty basic anyway. I just had some rectangular (angled off the leading corners) plate welded to a 4 in long piece of 3 inch angle and oriented such that the angle lays on top on the angle for the rake (that holds the tines). I drilled two holes in the new angle in line with the 2 existing outer most bolt holes that secure the tines. Took out the bolts and ran them thru the end plate angle and back through the tines.
I made the plates such that the tines run about 2 inches below the plate. As /pine said for his, they do also function kind of like the gauge wheels as well. I’m wondering if I should’ve made them about an inch or so shorter, but leaving as is for now, will be relatively easy (but not easily reversible) to cut an inch or so off bottom of plates.
Thanks for the idea and pics.