Micro ATX and Linux?

Chasuk asks: "I work at a large computer retailer in a college town, and I've finally convinced the powers-that-be to sell PCs with Linux pre-installed. The catch is, it will only be installed on Micro ATX machines, which require half-height everything, and we can't find a source of half-height Linux compatible PCI modems. Even those universal, generic half-height replacement hangers/brackets would be acceptable, but I can't find those, either. Can anyone on Slashdot help? "