They are 'technically' interchangeable. But the same springs will not work on all years or even from one car to another. You need to add the weight factor into the equation. For example; A car with aluminum heads would need a different spring than one with iron heads. A car with air conditioning may need yet another. Convertibles use different springs than coupes. It's all in the weight on them..... Raising and lowering with springs isn't always a good idea. You can change the front end geometry to a point that your steering can get funny. Handling can suffer.