Sorry, don't have a pic of it mounted but mine was bolted to the rear of my tuffy security console.
The tank was an 10lb nitrous bottle, the mount i think i got off of ebay for a steal and it's great, and of course, that's one of my tank covers on it - you can check them out if you want at: http://www.stu-offroad.com/recovery/co2/co2-3.htm
"Go ahead, take 'em off!"
Mine (10 lb tank) is mounted behind the rear seat standing up against the fenderwell (with the mount bolted to the fenderwell) on the passenger side. There's just enough room between the rear seat and the tailgate for the tank to be upright. I looked all over for a place to mount that thing, and that was the only place that would work. Some folks mount theirs on the rollbar, but I don't think you can do that and have the top on too.