New ATP speedometer cable repair kit.  This is the internal metal cable that rotates inside the sheathing of the speedometer cable assembly.  This is 120", and all Camaro/Firebird cables are under 120", so this will get cut to the length you need (there are numerous factory cable lengths).  You will remove your old cable, clean inside the sheathing, grease the new cable, insert it and cut to length.  Please be advised that this will only repair a speedometer cable with a broken cable.  Your sheathing, clips and ends must be functional, or you will need to purchase a whole cable assembly instead.  Fits the following:

70-85 Camaro
70-85 Firebird/Trans Am