Leaf spring difference.

For the Barracuda in 1966 the standard spring is 2525474 which is the standard A Body V8 spring. These are the same for both sides. The Heavy Duty Barracuda spring is 2495086. Same as HD Valiant and Dart. Station Wagon springs are different for /6, V8. The HD Station Wagon are different for the /6 and V8 and they use different springs left and right. It is also interesting to notice that for A Bodies there are different standard springs for 170, 225, V8, and 4 barrel Carb. So I would guess that in 65 the /6 and V8 springs would be the same unless one or the other was Heavy Duty. 7 1/4, auto or manual does not enter into the equation when looking at early A Body rear springs.