Bent the crease line up over the edge of the bench to match. I made the patch this big rather than try and weld in two triangular pieces as that would be more welding and coming together at a sharp point would distort badly. I try to get it the best I can before tacking and welding into place.
So longer one at the rear and stock one at the front. I think it is subtle enough that most would never pick it yet it gives me 40mm-1.5" more room between the back of the fan and the front of the engine.
I think the longer bonnet to match will help with the proportions of the longer/wider cab as well. The bonnet in the middle to cover the bigger V in the wider grille adds another 40mm-1.5", making the total bonnet 80mm-3.2" longer overall. Fixing up this welded up crack in the other guard. The other side was fine but they are prone to cracking here, so will cut it out rather than just smooth this old weld out.
Traced the curve and then added the lip width to it and then cut along that line before any shaping took place. You don't want to work with more material than needed when bending in a tight radius. Once the fold is hammered along the line with a high crown hammer to about 45*, I switch to this hammer I got from Peter Tommasini to finish off the folding into the inside corner. Checking against the corner being replaced before it is cut out makes sure you keep the radius the same.
Outside edge shaped to fit and corners rounded before I then scribe around the patch to cut out the bad section underneath. Welded into place making sure I had full penetration. If any of the join on the inside is still visible, I weld over it before any grinding has taken place. This means you are welding with the full weld depth on the outside stopping blow through.