MK Old Style Single Grid Switch Yoke Earth Terminal also fits metal socket boxes

CRABTREE Rockergrid Grid Switch Accessories - Switches Plates Grid Yokes

CRABTREE Rockergrid Grid Switch Accessories - Switches Plates Grid Yokes Boxes

Crabtree 6584/BG Rockergrid Metalclad 4 Gang Frontplate

Crabtree 6902 2Gang Grid Yoke Mounting Frame

Crabtree Rockergrid 5573 New 3 Gang Module Flush Moulded Switch Plate

Original MK Test Key For Emergency Lighting Grid Switches 3405ZIC Switch