Hi tammyfae,

Thank you for your interest in Real Sliding Hardware! The 174" track would be a custom order that we would need to do. Because of that, the product would ship in two pieces that would splice together. Any of the flat track kits would work well for this project as long as the doors are from 1-3/8" to 2-1/4" thick, meaning that you would be able to do the unfinished steel. The door weight should not exceed 400lbs each as the hardware would not be able to hold anything more than that.