This product is either discontinued or we cannot get that from suppliers.
ERGOTRON 97-984 SV43/44 Supplemental Double Tall Drawer, Capacity up to 1lbs, Electronic and key-lock access, Individual Internal Dimensions: 6"H x 5.5"W x 10.5"D, Compatible only with SV43/44 series carts, Electronic, and key-lock access, GREY/WHITE
The supplemental drawer attaches under a cart’s primary drawer to provide additional secure storage space. The double version provides two separate medium drawers.