The old Westside “ATW” 455 had a patch etched on the plow. I’ve also added one to my Blackstone 455. I used 5 thou styrene cut to the shape of the patch and attached it with liquid cement, pressing slightly on the edges to get it to splurge out a bit and create the weld seam effect.
What neither of these plots have is the bending of the metal done in steps as shown up in the photo In RGS Story 12 Page 104, but it’s a great photo of the patch.