4Box socket with two holes, compatible with Bticino LivingLight anthracite : Amazon.nl: DIY & Tools
BTicino LIVINGLIGHT COPRIFORO, Set of 2, Grey, SNT4950F - Amazon.com
BTicino SL4140V16FF Livinglight Presa Universale, Flat, Antracite & SL4180F Presa 2P+T 10/16A bipasso Serie Living International, Antracite : Amazon.it: Fai da te