The build released for Nexus 5 is the same as that provided for the predecessors, it is therefore of LRX22C . We refer you to download from the official site:
5 Nexus Android 5.0.1 factory image
In addition, we also the availability of the zip alleging ‘ OTA update , for those who simply want to update your version of Android and does not have the root or custom recovery.
5 Nexus Android 5.0.1 OTA ZIP
- Nexus 5 LRX21O to LRX22C : ZIP [13.3MB]