This discussion got me looking in my 65 Parts catalog and on page 5-8A the catalog lists Master Cylinder (Disc Brakes) - All Except Belvedere, Coronet and Imperial and shows a picture of the single master cylinder, then a gasket, then another part called a plate, then the additional reservoir. I can scan and post the page if anyone is interested in seeing it. The brake section does not list any disc brakes for the Imperial but does show 4 piston Budd calipers for the big Dodge, Plymouth and Chrysler. From the info I first listed, it appears the big C Bodies used the same extended master cylinder. One thing I noticed is that there's no part number listed for the additional reservoir. Would I use it? Absolutely not unless I were doing a complete nuts and bolts OEM restoration for judging like Ulf did.
