Most new cars run canbus systems which allow multiple voltages to be passed through one wire. In essence, u can run stop tail off a single filament bulb. Just take the bulb out and check, not hard to do
Simple 21w bulbs and as you say the canbus sends 5w for side lights and 21w for the brighter stop light.
Changing was a doddle used the screwdriver in the tool kit.
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