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Are you sure you have Cordoba 11.75" caliper brackets? The bolt pattern is the same for all 1970 and newer B/E/F/M/J/R body disc knuckles

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If your brackets don't fit, (too big) then your trying to put "C" Body brackets onto the spindles.
That ain't gonna happen.
Spacing is different.
Maybe somebody changed stuff on the Cordoba, that you say you got the brackets off of.
What brackets are you trying to use?
Pin type, or Slider type?