ive seen a tv ad for some paint that suppose to work really good on plastics, availible at k-mart, home depot etc... i cant think of the name of it and dont know how well it works. also dont know how well u can match the color, them claim to have a big range. besides that maybe talk to a body shop or sterio shop who do custom installs for interior, im sure they might know what to use.
What you want to use is a spray vinyl dye. A custom audio shop should be able to do it for you real easy. You can do it yourself also. Do a search online for vinyl dye. Don’t use the paint made for plastic at k-mart. It will give you the wrong texture and sheen if you are looking to match the factory interior. If you can’t find an acceptable match, consider shooting both the pillars so they look the same.