My '70 battery tray is body color, some color still left on it. You may wanna consider contacting a dealership they are reproducing the battery tray now. I have repro one from the Paddock and the new MOPAR one is far better quality with a subtle difference. The bends are cleaner than the original too and the repro bends are worse than the original.
I have included photos of what is left of the body color paint on my tray. Also a couple of comparison shots of the new MOPAR tray and the Paddock's chinese one (the one with the labels). The MOPAR one is more expensive but I only wanna do this once! I hope this helps!