You should indicate why you think it is missing (is it a dependency of something?) and where you have already looked. Also, search for <kuid:45324:4090> as this earlier version is much more likely to be available.
What sort of JR content? The item that it is a dependency of will usually have the information you need to identify what it is, and what could be substituted. Have you looked through the JR site? What was the result when you searched for <kuid:45324:4090>?