I have used a 4U rackmount shelf for my 990. The 990 wasn't affixed to it, but was merily sitting on it. It wasn't bad. It looks like a 3U shelf would work for the 976.
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Eric Desrochers
http://www.blu-ray.com/community/gallery.php?member=Deromax

" I hear no highs, I feel no lows, it sounds like crap, it must be Bose "