My friend is going to be giving me his old computer monitor so that I can run a dual monitor on my 2011 iMac for editing purposes. Naturally I appreciate this but want to make sure I get the correct adapter for it. It's an old monitor and can only do 1650x1020 resolution but that will do for me since the iMac screen is still going to be my primary. I believe that the monitor can only handle VGA so HDMI is out the window. Is this the correct adapter for the current iMac's to VGA? If so, would any adapter like this work? I would really rather not have to pay $30+ just for an adapter when I could probably get one half that price from amazon or something. Thanks in advance.