It's called a adapter kit for a 2.0 cmu mount fixture
NSN 6620-01-437-3146
NSN 6650-01-226-4819
NSN 5895-01-193-6401
NSN 5960-00-222-7772
NSN 5855-01-565-4475
NSN 6135-00-763-5793
NSN 6220-01-197-7680
NSN 6110-00-497-5470
NSN 5855-01-602-9653
NSN 5975-00-226-8429
NSN 5998-01-455-9232
NSN 5985-00-001-2749
Last Updated: 05/03/2024