I know where you could get it siver or nickel plated. Noles Davis specializes in anique restoration. They are off of Manor way just east of the green line tracks near Love field.
For a shop that is not into plating antiques, but might do it would be Texas Precission Plating in Garland. They are a block north of Forest close to the blue line station between Jupiter and Shiloh.
In Fort Worth, there is a plce that specializes in Harley Chome plating, but I can't remember the name.