What will make 1973 Dart rear package shelf black again?

I bought one and front covers all legendary stuff from Pro/Fit Auto Interiors. They sent me the wrong package shelf ordered and paid for speaker cutout but legendary sent one without. These guys were cheaper than buying direct. I sent them an email explaining what happened. they sent me a new correct one and said keep the first one as it would be a loss with return shipping.
That is customer service and I will sing their praises for doing the right thing.