A search on this forum seems to indicate that, while aligning the wheels, the steering can be locked / centered on all models.

But my mechanic cannot find the centering pin / bolt location on either my W124 or my W126. He doesn't find any mention of it in the documentation he has either. He wonders if the W123 isn't the last model with that feature.

So I am interested to hear from anyone here who is able to confirm either way.

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1991 W126 300SE (M103)
1995 W124 E320 Wagon (M104)

The 107 has it. To my surprise the 129 does not have it. The picture is of a 1996 SL600 steering box. The pen is pointing to the place where the plug should be if it had one.

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To see my 129 parts for sale visit:
http://stores.ebay.com/The-Mercedes-SL-Store
John Roncallo