Master Brake Cylinder With 20.64mm Bore Diameter OEM 171 611 019 D For VW Audi

There are 6 ports of the aluminum OEM 171-611-019D brake master cylinder, which size are same and it is M10x1. The piston diameter of the cylinder without brake fluid reservoir is 20.64mm. And the intercharge number is 258M0004, 171611019N, etc…