5340-01-612-3686 Aluminum Mounting Plate.Consists of (1) plate 12521550 (19207) and (4)INSERTS, .190-32 id. .3125 – 18 od, MS51830-201 (96906); roughly rectangular with cut out on bottom long edge; inserts near each corner. Fits M1 Abrams. USATAC 12521549. Really nice fab work. 14578 R5A3