Now I see what you are wanting to paint, one thing I have found when repainting plastic pieces is to make sure you purchase the Plastic Prep and follow the instructions carefully before you apply the paint, I have had problem with say the plastic hinge covers on the bucket seat hinges, with the paint peeling, I currently have the cover on the outside hinge on the drivers bucket seat, that I prep it, paint it, and it for what ever reason, keeps peeling, and when opening the drivers door on my coupe, the peeling pop's out at you, maybe because I know it is there and bug's me........
Classic Industries sells different colors of interior paint for around $20 a can, plus shipping charges, and they also sell the plastic prep, they are the supplier that I have bought the interior paint from in Medium Blue, check them out, I also think that if you go to your local Upholstery Dealer, they probably sell the interior paint you are looking for, maybe cheaper and no shipping charges, worth a try, .................