If you only want a new cable, this is the cable I like to use on most of my builds as the length is shorter than the kit ones so it routes much more cleanly and without sticking 3ft out in front of the handlebars.
Obviously, measure a bit before deciding to buy it, but it should work on the majority of builds. I always order 2 at a time since they are less than 10 bucks and it never hurts to have a spare, just in case.
Just search that description on Amazon for your country and you will probably find it or something similar easy enough, or search for a CG125 cable and just find the right length.