Unfortunately they are not in the default Update Centers so you have to add the SQE Update Center Manually.
Unfortunately again, at the time of writing, the SQE web site provide a wrong Update Center URL that leads to a 404. Who mentionned java.net ? :)
So, without further ado, here is the SQE Update Center URL:
Once the Update Center is added, the Available Plugin catalog contains a Quality category that contains cited plugins.
All the plugins are working fine on Netbeans 7.0.