Well, I got mine from Northern Brewer. No O-Rings came with the system, but I did get the instructions. I also bought a "Repair Kit" which has two flexible clear/white plastic "washers" which can be seen here: http://www.northernbrewer.com/brewing/catalog/product/gallery/image/2636/id/434/
I paid for an extra co2 O-Ring, which was shipped and looks exactly like the other "white" ones and not like this: http://www.northernbrewer.com/brewing/tap-a-draft-co2-o-ring.html
If I had to guess, I'd say there was a product change by "Tap-A-Draft" and the old o-rings are no longer provided - though why I didn't get any o-rings in the kit itself is a separate question (which I'll take up with "Northern Brewer" tomorrow). Got to admit that I'm kinda dissapointed with Northern Brewer - first no instructions with an All-Grain kit and now it appears they shorted me on some parts.
Edit: Forgot to mention - no box here either. Just 3 ziplock bags. Maybe TAD ran outta boxes?