mislead about late model master cylinders???

FWIW, The original master cyclinder on my 89 Dakota went bad. It was aluminum just like the one on my 99 Dakota. Went to the local parts store to get a rebuilt, they gave me one made of cast iron. Looked pretty much the same, the plastic reservoir plugged in, the ports were in the same place and the mounting flange was the same. I shrugged my shoulder brought it home and installed it. Was on the truck when I sold a couple of years back.