Monitor Mounting Bracket

I need to mount a 15" monitor in a car, and I need a bracket that will attach a VESA standard monitor (with four holes arranged in a square spaced 75mm or 100mm apart) to a headrest mount. http://gotcmt.sectorlink.org/eshop/catalog/985.htm Here is a picture of a bracket I have on another monitor (except that the holes are not spaced according to VESA standards): http://samuelkim.com/Public/LinkedData/MonitorBracket.jpg I got that monitor from Karview, which apparently went out of business. That monitor died, and I just want to replace it. I found a mountable monitor for $600, but comparable monitors (with RCA video input) sell for $400 without the right bracket. I figure the bracket should be available somewhere for closer to $20 than $200. Does anyone know where I can get a bracket like this? If not, is there another way of mounting a VESA standard monitor to this kind of headrest mount? Thanks.

Sorry, here are the links from the above post: picture of headrest mount http://gotcmt.sectorlink.org/eshop/catalog/985.htm picture of mounting bracket http://samuelkim.com/Public/LinkedData/MonitorBracket.jpg