My #1 is from Jan 2015, far from the original. I don't think much has changed though from the original. I think they always had wheels, but the wheels have gotten larger, handles added, and heating element improved. Other than that, I'm pretty sure they are the same. You can contact Steve at Smokin-it.com to see if there might be any issues with the current cart not fitting the most ancient of all #1's, but I doubt if there is a problem.