As Reg and Bandit said, you should be able to bodge up your old cable to work. Too short? Take one nut off at the lower lever and crank the adjuster all the way down. That should give you a extra inch or so. Still too short? Get a old throttle inner cable and use it. Or go to a hardware store and pick up a piece of wire rope the right diameter. You can also cut back the original cable outer sleeve to gain some length, but this can get tricky.
Then move the fitting to the new cable and you are ready to go. Use your old cable to get a good measurement of what the new inner cable needs to be. Then add a half inch for going thru the fittings. Cut the cable with a Dremel, a nippers will shred the end and make it difficult to push thru the hole in the fitting. I like to solder the ends to keep them from fraying until you get them thru. A bolt works well, drill the hole before you cut to length. It will be much easier to hold for drilling. You can also use a Vise Grips on the cable with the fitting in a regular vise. You should be able to pull the cable out of the fitting. Maybe add a little heat too. Or cross drill at a 90 degree angle to the old cable. You probably can't drill out the cable, it is too hard to drill. It would slip to the side.
