Use the Napa #4637337 cylinders, they're larger than the Dodge 1 ton and fit perfect. Just give them the number, they don't need to know what it goes on, seems to just confuse them.
I've changed out lots of Dodge 1 ton cylinders to the GM sized cylinders, everyone has been impressed with the improvement. For the $25 or so it costs this is the best bang for the buck mod you can do on a Dodge.