Correct paint color for a 1970 Dart 8 3/4 axle assembly

I was showing somebody old pics of my Dart and they wanted to know why my rear end housing was white... I'd forgotten all about it - late 1970s/early 80s we all put in airshocks, pumped them up and painted the now exposed rear end housing white. Why? Hell if I remember, we just all did it! Maybe we were showing off the 8 3/4 after trashing the 7 1/4 it came with...