No, they do not fit the ETek's that is one of the reasons for the lower price, nothing major but still one of the features only given to the 05,06 and 07 ego's.
I have found it is possible to fit them, but the only issue for is that their is not enough room, milling would be required which is not worth the hassel.
ETek's are great as they are, few smaller up's and youve got an awesome gat to play with.
Best bet to visit:
http://www.pbnation.com/forumdisplay.php?f=405
This is the ETek forum on pbnation, they should be able to help you out with an queries
- Sean
*EDIT* damn james beat me to it