If I'm not mistaken (and I can be at inopportune times ), that is one of the two internal hex screws that hold the power steering pump support assy from the top. Part #000931 008244. A washer goes with it. See #32. The size of attachment is the best I could do without effort. FWIW

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)