Can you believe I'm visiting this question again after almost an entire year? I totally forgot that I asked this.
Well, if anyone is interested, I bought the interior "dye" and the vinyl prep from Mid America and pulled the original red door panels and console sides and painted them black. What a difference, they look like new. I can't be more pleased with the appearance or the ease of use. The dye is very durable, I have had it on my car for eight months now and it shows no signs of the wearing or cracking that you might expect. Must be some kind of special formula.
Anyway, the secret is to clean clean clean the parts before painting, you cannot get them too clean. I brought my door panels into the shower with me and scrubbed them down really good, removing years of oils, armor-all, and dirt. After drying, I painted them with two coats, let them dry for a day, and voila, they looked like new. It's cheaper than spending $500 on new ones. Together with my new black carpet that I bought on Ebay, I now have a new black interior.
BTW, two cans was enough for me to do the console sides and the door panels with two coats. For a full interior, you might consider three or four cans. Better too much than too little, after all. Also, I did not use primer.