I have one of those grill guards for the 1/2 ton bumper. The contour for the bumper is 5-1/2 inches wide (where your red arrows are), same as the width of the bumper. I don't know how wide the big bolt bumper is (I am away from my COE right now). Hope this helps.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix