Having just bought a new CX-5 Sport Nav+ I was a bit disappointed with the stock interior light bulbs - just felt very retro compared with a lot of other aspects of the car.
Bit of digging found a suitable bulb instead of the £45 that Mazda want to supply them - the only issue being the front ones don't fit as well and need to be angled due to the extra bit behind the bulb housing - they do still fit ok when titled in the direction of the driver/passenger though.
Bulbs were from Auto Bulbs Direct and are the Ring RW2696LED 31mm long (269 type bulb) set of 6 (one spare as they come in packs of two) cost a whopping £25.50 inc VAT and delivered.
Will last a log longer than standard filament bulbs, kick out less heat whilst saving money on the cost of Mazdas bulb kit.