this one is quite a bit smaller in diameter. I did get the outer spring on A trim. I guess I could have been a bit more exact, I went through the instructions on the Transgo kit, the Sonnax tool and spring, and my Transgo Jr. kit. Every spring in all those illustrations are in their spots. I'm relatively certain I pulled something out I didn't need to, just cant figure out what. Other than this one I have all the replaced valves and one replaced spring accounted for.