you need a retail version of osx to install on any mac.  as waragainstsleep said..  those disks on ebay are model-specific factory install disks and will only work on other macbooks.

search ebay for "tiger retail" or "10.4 retail"

also, the retail disks are either PowerPC or universal.
Mac mini C2D 1.83GHz - 2GB RAM - 200GB 7200rpm HD
Sawtooth w/G4 1GHz - 1GB RAM - SIIG SATA w/2x1TB HD
B&W w/G4 600MHz - 1GB RAM - 2x80GB HD
Sawtooth G4 400MHz - 512MB RAM - 40GB HD
Dell Ultrasharp 2007WFP 20" Widescreen LCD
2.94TB Total Storage