Interior lighting package
Mazda part number 4100-78-827AA is the interior lighting package; a set of four LED bulbs to enhance the vehicle’s interior with white modern lighting, whilst also reducing energy consumption.
I fitted this accessory kit to my CX-3 today, and much prefer the colour temperature of the LEDs over the original incandescent festoon bulbs. The LED bulbs are marked ‘CE Canbus’, and measure 31mm tip to tip. They are a direct swap for the original bulbs in the front and rear overhead lights, and the luggage compartment light.
Fitting is very straightforward. You simply prise off the clear plastic lenses from the lights with a small flat headed screwdriver, and pull the old bulb out from between the metal contacts. Installation of the new LED bulbs is the reverse procedure. See pages 6-53 and 6-54 of the CX-3 Owners Manual.