This product is either discontinued or we cannot get that from suppliers.
ERGOTRON 97-827 SV Height-Adjustable Keyboard Arm, for SV LCD carts, Capacity up to 3 lbs, Easily lifts, tilts, pans, Height adjustment, Includes adjustable arm, mounting hardware, SILVER
Add height adjustability to the keyboard tray on a StyleView cart while retaining back-tilt capability and 180-degree pan rotation. Compatible only with SV40, SV41, and SV42 series StyleView carts with LCD pivot or arm