( Seller inventory # Lavender-23-CC/PO/Me) Select Comfort / Sleep Number Corner Lock System - Gray Replacement Corners These came off our old California King bed but i believe the size is universal and will fit any size sleep number or select comfort mattress. See photos for measurements - approximately 7" on both sides, and around 4-1/2" tall Qty : 4 Condition : Good pre-owned condition.