The cable is from the kart, you gotta remember, this started out as an old 3203 )))).
For next to nothing, you could probably hit the junkyard and pull a 1970-81 Firebird/Camaro parking brake cable. (later years had the center console handle) In the 70-81s it runs from the foot lever in the car to just under the driver's seat under the car where the inner ends with a threaded rod on it that's end-nutted into a curved hangar. Inside, it's an in-line barrel stud in a clevis with an over the top spring clip, pop that, and the spring clip on the housing end on the brake mounting plate. underneath, the other end of the housing has a threaded ferrule that goes against the floor pan inside and protrudes through it with a threaded portion an 11/16th or 3/4 nut. Spin that off, remove the nut on the inner cable end at the rear cable saddle under there. Under the carpet there will be two or three cable clamps around the housing and screwed into the inner rocker, remove those and pull it out from inside the car. 10 minute or less deal.
If you go to
www.performanceyears.com and search their online catalog, you can get either the front section as described for $35, or a rear cable which is pretty similar for 17.50. At some point, the rods on both the gas and brake will get replaced with these.