Downloads and more info:
Colored Hitzone Skins
Contoured Hitzone Skins
Hint for coloured skins said:
Red - engine, fuel tanks (possibility of fire).
Blue - the driver.
Orange - commander, gunner, loader (the crew members responsible for shooting and visibility).
Pink - weak armor.
Aquamarine - bad choice for shooting if you can hit other zones (stronger than pink, very high chance of ricochet).
Unpack the archive in /res_mods/<version>/, where <version> is version of your WoT client.
Sorry if my English is not good, I am from a non English speaking country.