Double wall fixing size 3, sockets with/without spacing

made of steel S235JR, galvanized
dimension a: 18 mm
dimension b: 80 mm
dimension b1: 163 mm
dimension b2: 41 mm
dimension d: 17 mm
dimension d1: 11 mm
dimension h: 123 mm
dimension l: 90 mm
dimension s: 6 mm
dimension x: 82 mm