What is the metal bar in this picture specifically named?

[Sperkowsky]

Are you talking about the Rev extrusion? Or are you talking about the turn buckles?

If it's the Rev extrusion I would stock up on mounting hardware. They use lp 10/32 nuts I believe which are hard to find. Andymark sells the bolts and nuts. Buy the nuts from them but I would buy the bolts from somewhere else as they are more easily found for cheaper and the Andymark ones strip really easy if you use a drill.