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 5985-01-395-6952
NSN 5905-00-413-8104
NSN 5990-01-529-7307
NSN 5999-00-441-3561
NSN 5990-00-008-1828
NSN 2925-01-357-2512
NSN 5965-01-160-7037
NSN 5925-01-184-0633
NSN 6135-01-517-6060
NSN 5965-00-532-3284
NSN 6110-01-069-2485
NSN 6645-01-242-9699