There used to be a site that everyone went to for the, but he no longer makes them.
You can try to search around thirdgen.org on the classifieds, but ebay is where I got mine. There are companies that can make them for you, to spec, and the prices range.
As for the size, normally its 2 inches. 4th gens have a 54mm backspace IIRC, which is about 2 inches. Make sure you use a propper torque wrench when you tighten them down, and do it again after you drive it.
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2/20/2013: They Day the ****s Stopped
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