Doesn't matter as even cheap ones don't allow the standard AV cable to fit. Be careful about second hand information.
All I've got is second hand information about the subject since I dont have a HDMI 360.
Nobody else bothered to mention about the possibility of it not fitting if he wanted to use the A/V cable for 5.1 so I mentioned it instead.
I wasnt sure about it so I said buy a cheap one incase it didn't fit.