Anyone know the frame width of the big broncos like 78-79 and after?

I have this drop bracket for the radius arm and its 4 inches between mounting points where as my EB frame is only 3 inches wide.

I believe that full size ford's are 36" center of frame to center. Mid size like my explorer are 27" center to center. Those are the measurements I've taken while trying to figure out how to fab up a bumper for my truck.
Pornstar, i'll give ya a shout tonight.

I meant the width of each framerail, but thanks! I may just weld in 1/2" thick steel on each side and mount from there but have some other ideas first.
LESLIE