We used to buy a lot of cable in bulk from places like Rotory corp. , Stans and others.
We would buy the cable solid steel, or braided in diffrent sizes.. Plus the outer housing was also available in plastic, plastic wrapped steel, or plastic wrapped steel with teflon insert..
Most of the time we would try to just buy the OPE cable (just for the time involved), but if we had some odd unit we could not find a cable to install, we would strip needed parts off the old cable (throttle quadrant ends, springs and such) and build our own to fit...
Friiy