Motorola Internal Pci
A look at what is currently available on eBay
 Motorola 56K PCI Internal Modem - ENF656-GSW-MOPR US $6.99 
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 Motorola 56K PCI Internal Modem - 62412-51 US $5.99
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 Lot of 2-56K V.92 Internal PCI Fax Modem-Motorola 330102 US $18.95
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 Motorola 56K PCI Internal Modem Card ENF656-GSW-MOPR US $6.50
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 TP-Link 56K V.92 Internal PCI Fax Modem, Motorola US $18.00
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Ok You Tell Me If This Mac G4 Is Any Good Or It Will Need Upgrading And Will I Be Abe To Run Mac OS X Leopard?
Processor: 1x Motorola PowerPC G4 400 Mhz
Memory / RAM: 256 MB (installed) / 1.5 GB (max) - SDRAM 133 MHz
Storage Hard Drive: 20 GB Ultra ATA-66 Hard Drive
CD-ROM: DVD ROM
Video Output Graphics Card: AGP 2x 133 MHz
Audio Output Sound Card: PCI - stereo - 16 bit
Communications Fax / modem: PCI - integrated - 56 Kbps ( K56Flex, V.90 )
Network adapter: PCI 10/100B-T Ethernet
Power AC 115/230 V ± 20% ( 50/60 Hz )
Storage Controller IDE / EIDE ( DMA/ATA-66 (Ultra) ) - PCI
Memory / Cache: 1 MB L2 backside cache
2 USB ports
3 400 Mbps FireWire (1 internal) ports
The processor doesn't meet the system requirements for Leopard.
Per Apple's website (typos and all!), you need:
"Requirments for Mac OS X 10.5
Mac OS X 10.5 requires:
* A Mac computer with an Intel, PowerPC G5, or Power PC G4 (867 MHz or faster) processor
* 512 MB memory or more
* A DVD drive for installation
* 9 GB of available disk space or more"
http://docs.info.apple.com/article.html?artnum=306515