Heres the shaker. I guess I had it backwards (mine hasn't come yet) the metal shaker goes IN the fuel can.
http://www.autobarn.net/shakersiphon.html
I tried a search on the low profile fuel storage but came up with nothing. I'm sure there was a thread here. I think they were grey and I beleive stackable. They would be pretty easy to mount over or under the stock roof bars I think.