Auveco is said to be The World's Largest Selection of Body Hardware and Specialty Fasteners, since 1916. Here is their contact information.
Location, Cold Spring, KY (800) 354-9816 (859) 341-6450
You can look up parts in their online catalog or download it. Section 20 pertains to Ford parts, though I found the Ford Window Regulator Roller Assembly in Section 17.