First, set the front wheels straight, use something to make sure the steering wheel does not turn, mark the coupling and shaft of steering box for realignment, and mark the position of the pitman arm in relation to the steering box. If you don't do the above there is a good chance you will be doing the job again (don't ask how I know). I have done this job on the 107 and the 126 and believe the 107 is a little harder.

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84 500 SEL (307,xxx miles)