Retro, it should be easy–depending. A few questions for you? Which Shipmaster, the one with round knobs or the newer one with shaped knobs? If the round knobs, do you insist on the original cables with rubber sheath, or will you accept the much better ones with the plastic adjusting nut? The original ones with rubber sheath are obsolete, but the newer ones will replace them. That is, newer up to 1979. Newer than 1979 are a whole different cable.
Come back with more info, for better answers.