Brake servo

I need to either replace or have rebuilt the brake servo for my S4 SE restoration. I have the original Girling unit & haave a newer Lockheed unit. Does anyone know of a company that does rebuilds hopefully in NA. I live in Ontario.

White Post in Virginia is a reputable rebuilder of all hydraulic items. Not cheap but fast turn-around and warranteed work No commercial interest. They did my +2 servos and master cylinders nicely.
whitepost.com/
John in Virginia