If you need it Brass Knob has it.
All reviews seem positive
Opened in 1981, The Brass Knob Architectural Antiques is Washington D C's premier dealer in architectural artifacts and vintage house parts. The main focus of the store is selling authentic American antique, vintage, and previously owned architectural details for both residential and commercial restorations, renovations, and to add interest and charm to new construction. The majority of the items on display date from 1870-1940.