How to penetrate S35 CA weak spots - World Of Tanks

World Of Tanks - armor test.
Tank: S35 CA
Type: Tank Destroyer
Tier: V
Country: France
Game patch 1.3.0 (test)
Used:
Pz. III E 50 mm Caliber / 60 mm Penetration (AP)
M5A1 Stuart 47 mm Caliber / 81 mm Penetration (AP)
Crusader 57 mm Caliber / 110 mm Penetration (AP)
M4A3E8 76 mm Caliber / 38 mm Penetration (HE)