Post your WW2 unit graphics in this thread.
Deal. Id' propose an M-30 for the 122mm piece: http://en.wikipedia.org/wiki/122_mm_howitzer_M1938_(M-30)
The older M1910/30 is part of Fairline's Red October set:
http://en.wikipedia.org/wiki/122_mm_howitzer_M1910/30
For the 76mm I'd suggest the USV (Fairline's piece is the ZiS-3 that replaced it)
http://en.wikipedia.org/wiki/76_mm_divisional_gun_M1939_(USV)