That is a standard 43bc type cable by the number you gave. You should have no trouble acquiring one through any decent boat shop. If you can't find one, I'd contact Rex Marine .
One important note. Morse was bought by Teleflex. From information I was given at my local shop, the Teleflex replacement cables have a smaller outside diameter than the original Morse cables. This can present a problem where the cable passes through transom adapter. May not seal tightly enough to prevent leaks.