Regarding the valve stem caps, careful what you put on. It sounds trivial, but my wife's Olds received a set of aftermarket aluminum caps less than a year ago. They are now oxidized onto the threads (solid), and not even a pair of vice grips will get them off. We have to replace the entire stems.

As for the cup holder, the base coupes don't have them. Any Chrysler dealer should be able to order one as a genuine part for a base coupe. I never had a cupholder, though I will admit that my wife made me buy a plastic one that slips between the console and the seat. I hide it in the trunk when not in use. It's the same cheapo POS that some guy is shamelessly selling on E-Bay for $10-20. But you can get yours for five bucks at Murray's (as I did).