What does your email template look like? I suspect you will have to modify the variables a bit in order to add the info you need.
You'll first need to figure out where this data is in LEM - look for an example Event ID 646 either using nDepth, reports, or a filter. Take a look at where the data you're interested in is. Then, look at the email template (as evanr suggested) and see what you need to add, THEN go to the rule and make sure it's hooked up.
If you need more details let me know, we can probably drum up a sample here and get you going.