I know that you all know most everything about trucks so I'm going to ask you. I am looking for the name of a type of steel for the running board on my old fire truck. I need a piece to cover the rear where the hose bed goes on and lines up with the rear step. Anyway, I don't know what they call it. I know diamond plate is used on our new firetrucks but what is this stuff called and where might I purchase a 6'x 1' piece? Picture link: http://rides.webshots.com/photo/2382042990080243953lXxyvT