You can contact Shaun Saber at Active Silicon and ask for the "Catalyst driver" He can send you a link. I suggest you update your 2007 Macs to Leopard 10.5.8.

Remove the Cards. Re-Install OS X. Use the PCI utility on OS X to adjust the PCI slots to work correctly with the cards. You are probably using the single lane cards and so you can set the PCI slots to be single lane. Also be aware that the bus speed on the 2007 Macs is 1.6 but the bus speed on the 2008 and 2009 Macs are 2.0.

Shutdown and install the Phoenix Cards. Restart and Install the drivers from Shaun. Reboot and then install Catalyst.

In Catalyst preferences turn on the correct number of video inputs. Also note that you do not need to use the LFG digitizers if you are using the Phoenix Cards.