I have a 1965-66 Kelsey-Hayes proportioning valve that is in pristine condition, am not sure this one was ever used/mounted. This proportioning valve has sharp lettering, no pitting, no rust. This is for a 1965-66 Mustang, Shelby, or Corvette with front disk brakes. Please PM me with your email address and I will send you photos. Asking $500.
