Below is the part number for the 7406/7407 chip if you need to change the polarity of your amp enable on select ICMs. Note, the desired configuration can be ordered directly from Galil at the time of ICM order. Just specify -HAEN or -LAEN. The below chip is only required if changes in the field are desired.

Here is the link for 7406 (Inverted, LAEN)
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-1435-5-ND
Here is the link for 7407 (Non-Inverted, HAEN)
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=296-1436-5-ND

See the following Application Note for more details:

http://www.galil.com/download/application-note/note1415.pdf