Ah yes, my bad,
In regards to the Ear amplification system i am in contact with the maker to see if he knows a way to implement these into our buckets. but if it fits in a tusken raider lid i cant see ours been much different.
He also has a website up with shows more pictures then the clone trooper forums;
http://www.activearmor.ca/?page_id=48
As far as the fans go, (again I've hit up the maker to see if they will be compatible) but here are some picks from the forum. prices range from $20US - $50 US.
Single
Dual
Single mini
Dual mini
Hope that helps