520849 Brake Master Cylinder, GI 64067720, CB (Compression Barrel) Type:
Series II/IIA 88 up to Chassis:
24131336D, 2443162D  Petrol Models
27108693D, 27405072D Diesel Models

Can be used on Series 1 (with 10" brakes), the only difference is the flange mounting: Series 1 used a 3 bolt fixing (triangular flange), this type (520849) is a 2 bolt fixing, top bolt same position, new hole to be drilled into outrigger to accept bottom bolt fixing. Original Series 1 pushrod to be retained.