You can get it on Sachesi with the following information.
Country: 310
Carrier: 160
Device: Z10
Variant: STL 100-3
or
Device: Q10
Variant: SQN 100-5
If you prefer loading your OS from scratch, here are the Autoloaders:
STL100-1: http://l.bitcasa.com/hhb7C4c2
STL100-2/3: http://l.bitcasa.com/X_x_owAf
STL100-4: http://l.bitcasa.com/RyrGKbdy
Q10/Q5: http://l.bitcasa.com/f6dhsLbp
Z30: http://l.bitcasa.com/q6mcMGrh
[Credits: thurask]