i've also been searching for about 8 months now to find baby moons for my wheels but i have the 16" 8 lug wheels. you however are in luck. what you need to do to make sure is measure the distance from the tip of the tangs across the center of the wheel.
this cap would probably fit your wheel.
http://wheelskin.com/cbm10.html now the description says 10" and up. well for me, my measurement was a red hair under 12". i e-mailed then and got a reply (rather promptly) that they were for pretty much under 11". if you are unsure, i'd say e-mail em. hope it helps.