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How bad ? Don't know. But it mounts to the front of the starter and then to the block. Take a look and see if there is one already there. I suspect it is to prevent front twist and to ensure alignment between the flywheel and starter teeth. Have you had any issues starting ?
Never had a single problem with it. By any chance does anyone know what the bolt sizes are? before i jack the car up again it would be nice to have all the necessary parts.