You could probably safety wire it in place.
I see a little hole down between the two cables that would serve well as a lashing point to hold the plastic boss into the retaining slot of the bracket.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.