If Rawr did not find the item in the armory, you can do the following:
1. Search for the item on thottbot or wowhead. Note the item ID in your address bar.
For example: My mage, for lack of a better drop, still has Harrison's Climbing Hook. Searching for that on thottbot gives an address of http://thottbot.com/item=65787 - Item ID is 65787.
2. In Rawr, select the options menu, select Edit Items...
3. In the window that comes up, click on the add button at the bottom of the window, and enter the item id there. That will pull the item info from the web, populating the item on your character.
All my instructions assumed the wpf version of Rawr, I don't use the web application.