Four through holes at the corners and two brackets, one centered on the width on each side; the outermost holes in each bracket have a 0.79" x 0.10" tube between them; a 0.5" x 5.5" unc 8.8 is0 898 steel zinc plated bolt with washers and a nylon insert locknut goes through the tubegoes through the tube a 0.79" x 0.10" tube with a 0.5" x 5.5" unc 8.8 is0 898 steel, zinc plated bolt with nylon insert locknut and washers through it
NSN 6240-00-866-6239
NSN 5855-01-458-8137
NSN 6610-01-204-7281
NSN 6240-00-994-4056
NSN 5985-00-581-7756
NSN 5925-00-111-1969
NSN 6650-01-392-7045
NSN 5996-00-269-2655
NSN 6645-01-372-0126
NSN 6110-00-902-1702
NSN 5999-01-457-6589
NSN 6145-01-154-7183