I think the next run will be all carto tanks. These are really universal cause you can cut a piece of carto tube for the top cap & run them with ce2's. I think you'll find as soon as you use the carto setup, you'll never want to see a ce2 again.If you want a CE2 you order that way if you want to use a punched 510 carto you order that way . There are 2 different styles CE2 no filler 510 carto uses filler