I am not sure your car came with limiting cables. Very few 66 cars received them. Mostly override t-bar cars were more likely to get them. One way to tell if your car had them the axle bumper would be removed and a eyelet put in place to loop the cable like the 65 cars. If the bumper has not been cut off your car it didn't likely receive the cables. Here are a couple of photos if you can use them. May be a topic for a new thread.
First 2 images are 66
last two are 65