This product is either discontinued or we cannot get that from suppliers.
Ergotron 97-963, Durable aluminum composition, Easy to install, Includes travel-stop, attachment hardware, SV Drawer Travel-Stop, 5"/13 cm.
When adding a 3rd row of tall drawers to SV43 or SV44 carts, use Ergotron 97-963 accessory to prevent the bottom drawer row from impacting the base of the cart.