If you're talking about the metal piece that goes in the back of the case when a PCI slot is not in use, Macs use the exact same ones as PCs - you should have no trouble at all getting one, and I certainly wouldn't pay for it.

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I never even thought to check :I

I have a dozen or more PC ones in a box and found a flat one that was almost identical to the ones in the 7500. I wasn't really expecting to pay for one. Was figuring that if I was getting the other parts off someone and they had one, they'd just throw it in. In any case I've got most of the parts winging their way to me. Apart from the support arm but that's not really all that vital.