My shower faucet is the kind that has 2 handles that are in the shape of x's (called cross handles). They are silver. In the center of each handle is a cirular cap with a c for cold and h for hot on each one. One of these caps is missing - the one that signifies cold. I was wondering if it's possible just to get replacements for these caps. I don't care if it has the c or h on it, as long as it's silver and fits, I'll be happy. I don't want to have to replace the entire faucet system for such a minor thing.

I highly doubt you will find just the cap. Most of the handles are standard parts. Check hardwares and home centers and pick out something you like, and buy a matching pair. If you have trouble getting the screws or or the handles off, pos back, or doa search here. It comes up now and then in plumbing.

If It Is A Delta Or Other Name Brand , I Know Lowe's And Homedepot Do Carry Replacements For Them, Now Where They Have Your I Don't Know But If Not Any Plumming Supply House Could Get Them