I'm looking for the following parts from a 77-79 Deville rear brakes.

proportioning valve
backing plates
calipers
brake lines on rear
rubber brake line from rear to hard line
bracket on rear end cover to mount lines
rotors*

Hey Z27 : In regards to your brake part request, The best place I have found to date is usapartssupply.com . I have the catalogue for the 1977-1985 Caddy models and just about everything that you wanted is in there. You can order the cat. online or just browse your parts and they will send them to you. Good luck and enjoy your ride.