I am dyeing my rear side panels and A pillar mouldings white this week. Call Just Dashes and order their dye kit. I had them recover my door panels and seat backs, but didn't have them do the rear side panels because they were in okay shape. Instead, I bought the complete dye kit directly from them. I sent them a material swatch from my new Legendary seat covers and they mixed up a dye to match. It was then used on my door panels and seat backs, and the remainder (enough to do an entire car) along with all the necessary supplies was sent to me to complete the rear panels myself.
FYI -- I had the local Carquest paint store use the same material swatch to mix up a rattle can of matching semi-gloss paint for the interior trim pieces.