HUGE double roller chain or crawler / excavator track chain & grouser pads

Wanted to buy, huge double roller chain or crawler/ excavator track chain and grouser pads. Looking for double roller chain which would maybe be 12 or 15 in from outside link to outside link, or crawler chain with track pads. Wanting about 12 Ft worth, I'm looking to make a circle out of it weld it and use it for a fire pit, so if you can imagine a tractor rim fire pit wrapping the double roller chain or the crawler track around the outside of the fire pit and Welding it in a circle that's the concept, anything out in the Williston basin?