Which Airport Card do I need to run Handoff?

I have an early 2009 Mac Pro tower. I've never had a need to have wifi in it since it is always hooked to an ethernet, so I never installed an Airport card. Now I have Yosemite and one of the most important features in it to me is Handoff, but I need an Airport card to make it work. I did some digging and found the "community activation tool" to make it work with slightly older hardware. I assume I'll need to buy an upgraded bluetooth dongle as well, but can someone point me to the proper wifi part I would need to purchase and install to get handoff working on my tower? From what I've seen, I have to get an Airport card that is newer than what would have been original equipment with my Pro.

It is a MacPro4, 1

Thank you.