Where can I just get the 2 brackets that mount to the back of the LCD/Plasma T.V?

I bought one of those TV stands where the TV hands in the air but the guy I bought it from forgot to remove the brackets off his tv when he sold it. I went to Best Buy, Walmart, and Meijer but they don’t sell them separately? Anyone know where I can find it?

Its just the 2 brackets that mount to the back of the T.V