The search within GrabIt isn't necessary. Just visit this link, press "inverse type by rar", then press "create NZB" and save the file to your computer. Open it with GrabIt and you're good to go.

http://www.binsearch.info/?b=Leopard-10.5.2-AMD-EFI&g=alt.binaries.mac.cd-images&p=zephyroth-osx86%40hotmail.fr&max=250