Mounting tabs are about 13 inches apart. Overall it is 18 inches wide.
By Fogleman on September 28, 2017
Outside to outside is 31 1/2”. The screws are 30” apart.
By Amazon Customer on September 21, 2017
I don't think this model would work. The length of the rail between the mounting brackets is about 31 and 1/4 inches, by my measure. And because the rail has threaded holes at either end for mounting, it can't be shortened.
By Amazon Customer on September 25, 2017