if you like sram shifters... they make a 2:1 line compatible with shimano rear derailleurs. the 'attack' line looks identical, is equivalent to, and has pretty much the same tech as the x-7 triggers and gripshifts...

http://sram.com/en/sram/mountain/21s...tack/index.php

but if you're asking about the x-7's specifically, no such luck.