Because my grand pop painted everything on the undercarriage of the car black, I want to detail everything back to the original colors. I know the lower control arms were bare metal and dipped in cosmoline and the strut rods were natural steel color as well. What was the color of the nut that held the strut rod to the lower control arm? Was that a gray phosphate color or was that like a clear zinc? Sorry, car is a 69 RR.