A drain plug is a must, in my opinion. I think Perk is right, most all repo tanks are made by the same folks. They are easy to install and look very nice.
I also have another recommendation. For our tank, we immediately clear coated after installation. The tank is much easier to clean grease, road dust, etc off of tank. It makes the tank alittle more shiney than new, but I don't think it will show it's age in the long run. Just my opinion.
Paul