My old brushes are horribly worn down so I bought some replacements. Even though they're listed as being correct for my year they're not the same as the originals. My originals have a semi-rigid cylinder surrounded by a spring, topped with the copper connection post. These replacements look the same, minus the cylinder. They're just a spring with a wire running through, topped by the copper connection. They don't seem to have much rigidity and I can't see how they're going to stay in correct position to contact the ring. Has anyone used these type before? I don't see any other type sold. Thanks!