Cage 9r636 is the oem
A structural shape fabricated from a ferrous or nonferrous material and has a flange extending usually at right angles in the same direction from each edge of a web and/or resembling the letter u in cross-sectional form.
NSN 4140-00-078-9357
NSN 2925-01-026-1000
NSN 6320-01-481-7322
NSN 5975-01-650-8317
NSN 5930-01-541-5462
NSN 5975-01-579-3980
NSN 6110-01-372-4224
NSN 5965-01-472-3664
NSN 5935-01-359-1408
NSN 6135-01-512-8020
NSN 5996-01-387-9664
NSN 5965-01-105-1645