The yoke is the same as any other K code mustang, which is the same as every other V-8 Mustang. On the K codes the drive shaft itself was a bit shorter to compensate for the 9 inch rear end center section sticking out a little further, but the yoke is the same. Earlier cars, up until around Jan of 65 used the 25 spline yoke, part # C2OA-4841-A, while later ones used the 28 spline yoke, part # C3AA-4841-B, but 40+ years is a long time and a lot can happen to car.You probably should just count the splines in the tail section and see which one you actually need.