Elo E203787 L Bracket fits some 15 Inch Touch Monitors
E203787 L Bracket for the Elo 1537L and 90 Series Open-Frame Touch Screen Monitors

Two standard ("L") mounting brackets are included when buying a new 1537L.
This part# is for an extra set of 2 ("L") brackets

Mounting Diagram
When ordering this item, use this part number: E203787