There are actually two different designs over that year range I do believe. One is quite a bit thicker than the other, both have the same size bolt hole but the lock to stop it from pivoting past a certain point is also different.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k