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 5985-00-323-0290
NSN 7035-01-568-1987
NSN 5915-01-049-9256
NSN 5990-01-261-2962
NSN 5915-01-197-1857
NSN 5990-01-586-2475
NSN 6650-01-152-9425
NSN 2925-00-233-5644
NSN 5999-01-268-1461
NSN 6110-01-553-6362
NSN 6320-00-371-8335
NSN 6320-01-220-2264