EMG's are all rail pickups, and many times people who want to go with active electronics on an 8, 9, 10 or 11 string guitar/bass will go with one. Also, the 5-string bass size (their "40" housing) is a direct fit for a lot of 10-string pedal steel pickups, again for someone who wants to go active with no metalworking.
http://www.sevenstring.org/forum/extended-range-guitars/41732-roter-10-string-erg-update-56k-no-way.html
http://www.sherman-guitars.com/10_string.htm
http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendID=76892925
There's lots more than one kind of nut in the party bowl..... :hello2: