ServoWave was originally a Canti Tech, they just used it a bit later for V's (craply for the M600 series as it wasn't really) and later it lost its 'wave' and what was servo I don't know ;-) Of course later again is back out on disc's
anyway.
XTR :M900, M910
XT :M092 (the original), M095, M737, M738
DX :M075
all 2 finger, but all will need the shifter hanger lopping of if you don't want them. some come of neater/easier than others