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 5998-01-037-8058
NSN 5975-01-422-7729
NSN 5998-00-278-7350
NSN 2925-01-448-2880
NSN 6130-01-468-6484
NSN 7035-01-424-7019
NSN 5910-01-107-8001
NSN 6105-00-114-0966
NSN 5835-00-126-2961
NSN 6150-00-258-9055
NSN 5895-01-051-9963
NSN 5835-01-180-9441