I'm going to be looking on Amazon.com for the pieces that Moose listed and, if I remember, I'll list them here with links.
I had no luck with Amazon and ended up getting everything from Lowes.
Everything seems to be working as it should except I need to crank the filter housing a bit tighter (gonna need wrenches, as it's already as tight as I could get it by hand), it's leaking about one drop of water per hour right now, which isn't a big deal, but I'm not comfortable with any leak, really.
The other thing is that I don't think it's getting enough water flowing through it. It's on the output of my Eheim 2226, and a pocket of CO2 is forming at the top of the reactor. No bubbles are driven even a third of the way down the filter housing. It's acting like more of a bell than a reactor. Guess I just need a stronger pump?