Jim Tomarchio recommends you investigate a company called Eastwood that sells restoration and touch-up products. Also, at least one DSMer has successfully obtained interior paint from a dealership.
Tristan Santoniello recommends you use acrylic paint and clear coat on the panels, using 3-5 coats of each. He also suggests you remove the panels completely before trying to paint them. Another DSMer suggests vinyl paint, again using several coats until you can get a smooth coat, and sanding lightly between each coat. The sanding helps the paint stick to the previous coat.