Buy videocard bracket?

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I am looking to install a 7900GTX in my computer but since i have a BTX case (from Dell), the double slot bracket won't fit correctly. I could hack off half of the bracket of the videocard (the half with the vents) but then that would void the warranty. I need a bracket from another videocard, preferrably a 7900GT, so I can switch the brackets. Does anybody know where I can get just a bracket without buying a videocard along with it?

Pictures for reference:
7900GTX
7900GT

 

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[^eMpTy^]

I had this exact same problem with some x1900xt's and a Dell case. I ended up just cutting the brackets down. I seriously doubt cutting the bracket would void your warranty.