The metal tabs you need to release to get this assembly out of the roof carrier assembly. To get this out of the roof carrier, use a screwdriver from below (meaning cabin-side) to get to each tab (note the hole below each) and pull (gently!!!) the front edge down, tipping this unit. The rear edge is not locked by clips/etc. You will have 2 electrical connectors to deal with, handle accordingly (hint -- one is in that green area, use a small screwdriver to gently loosen/unhook).