Below you see per country whether this part is street legal on a Citroën C4, what you have to do, and where to buy one.
Rear windows can be tinted within limits. Tint or film on the front side windows and windscreen is not allowed, except a sun band on the windscreen.
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Rear windows may be darker. The windscreen and the side windows next to the driver must let at least 55% of the light through.
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We have no checked rule for this yet. Ask your inspection station before you buy.