Outside bottom rear cab flange replacement

[66C10LB]

Does anyone have experience in replacing the outside bottom rear cab flange (just the bottom flange area, but all the way across the back of the cab)? Is this best created with a bead roller? Should it be with a male bead of perhaps 1/4 inch diameter plus a polymer wheel to "tip" it in the positive and the negative directions that are needed for the shape of the flange? Is there typically some shrinking and stretching to do after this is created in the contours that are needed? Any other suggestions on tools and how to achieve this? See image.