Merlin: I just downloaded the N66 sourcecode from 4/22 located here:
http://dlcdnet.asus.com/pub/ASUS/wireless/RT-N66U_B1/GPL_RT_N66U_90043802695.zip
It unzipp'd & un-tz'd fine, and seems to me to have the closed source bits you need ... (as you defined a few pages ago)
When I download from that link, I get a zip that contains the March 22nd tarball, which is the version missing all closed source components.