These sway bar brackets are meant to be used for applications where you can but use a through bolt and need to weld the bracket to the frame. 1977.5-79 F250 4wd frames in particular are like this and that is the application I designed these around, although they will undoubtedly fit other applications.

3 5/8" center to center of the two bolt holes
 
This should work with a variety of front sway bars. I designed this around a 2013 F350 4wd front sway bar.

This is for one pair of raw steel brackets, no hardware